Regarding increasing the size

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C#

I am using haarcascade_frontalface_alt_tree.xml to detect face from video. I get result also but the problem is the frame size of the face of every person is not the whole size of face. I am missing the upper and lower part of the face. I want to increase the size of the frame gets cut from the video.

private void ProcessFrame(object sender, EventArgs e)
      {
          try
         {
              //Step 1: Video Capture
             if (videoCapture != null &&
                 videoCapture.Ptr != IntPtr.Zero)
             {
                 videoCapture.Retrieve(frame, 0);
                 currentFrame = frame.ToImage<Bgr,
                 byte>().Resize(picCapture.Width,
                 picCapture.Height, Emgu.CV.CvEnum.Inter.Cubic);

                  //currentFrame = frame.ToImage<Bgr, byte>().Resize(axWindowsMediaPlayer1.Width, axWindowsMediaPlayer1.Height, Emgu.CV.CvEnum.Inter.Cubic);

                  //Render the video capture into the Picture Box PicCapture
                  ////  picCapture.Image = currentFrame.AsBitmap();
                  ///

                  //Step 2: Face Detection
                  if (facesDetectionEnabled)
                  {
                      //Convert from Bgr to Gray Image
                      Mat grayImage = new Mat();
                      //Size minSize = new Size(30, 30);
                      // Adjust as needed
                      //Size maxSize = new Size(150, 50);
                      // Adjust as needed

                      CvInvoke.CvtColor(currentFrame, grayImage,
                                        ColorConversion.Bgr2Gray);
                      //Enhance the image to get better result
                     CvInvoke.EqualizeHist(grayImage, grayImage);

                      System.Drawing.Rectangle[] faces =
                      faceCasacdeClassifier.DetectMultiScale
                      (grayImage, 1.1, 3);
                      //If faces detected

                      if (faces.Length > 0)
                      {
                          // lbl_FaceCount_Data.Text =
                          // faces.Length.ToString();
                          foreach (var face in faces)
                          {
                              //Draw square around each face
                              CvInvoke.Rectangle(currentFrame, face,
                              new Bgr(System.Drawing.Color.Red).MCvScalar, 2);

                              //Step 3: Add Person
                              //Assign the face to the picture Box
                              //face picDetected
                              Image<Bgr, byte> resultImage =
                              currentFrame.Convert<Bgr, byte>();
                              resultImage.ROI = face;
                              picDetected.SizeMode =
                              PictureBoxSizeMode.StretchImage;
                              picDetected.Image = resultImage.AsBitmap();

                              if (EnableSaveImage)
                              {
                                 //We will create a directory
                                 //if does not exists!
                                 // string path =
                                 //System.IO.Directory.GetCurrentDirectory()
                                 // + @"\TrainedImages";
                                 string path = Value.ValueG._DataFilePath +
                                 "\\Video\\FaceFind\\Video" +
                                 Value.ValueG._CaseVideo_Id;

                                  // string matchingImagesFolderPath =
                                  // "C:\\Path\\To\\MatchingImagesFolder";
                                  string path1 =
                                  System.IO.Directory.GetCurrentDirectory()
                                  + @"\TrainedImages";

                                 System.IO.Directory.CreateDirectory(path1);

                                  if (!System.IO.Directory.Exists(path))
                                 System.IO.Directory.CreateDirectory(path);
                                  //we will save 10 images with delay a
                                  //second for each image
                                  //to avoid hang GUI
                                  //we will create a new task
                                  Task.Factory.StartNew(() =>
                                  {
                                      for (int i = 0; i < 1; i++)
                                      {
                                          //resize the image then saving it
                                          ////  resultImage.Resize(200, 200,
                                          //Inter.Cubic).Save(path + @"\"
                                          //+ txtPersonName.Text +
                                          //ImageCount +
                                          //DateTime.Now.ToString
                                          //("-hh-mm-ss") + ".jpg");
                                          //// ImageCount++;

                                          resultImage.Resize(200, 200,
                                          Inter.Cubic).Save(path + @"\" +
                                          txtPersonName.Text + "_" +
                                          DateTime.Now.ToString
                                          ("hh-mm-ss") + ".jpg");

                                          //resultImage.Resize(200, 200,
                                          //Inter.Cubic).Save(Path.Combine
                                          //(path1, txtPersonName.Text +
                                          // "_" + DateTime.Now.ToString
                                          //("hh-mm-ss") + ".jpg"));

                                          Thread.Sleep(1000);
                                      }
                                  });
                              }
                              EnableSaveImage = true;

                              if (btnAddPerson.InvokeRequired)
                              {
                                  btnAddPerson.Invoke
                                     (new ThreadStart(delegate
                                  {
                                      btnAddPerson.Enabled = true;
                                  }));
                              }
                          }
                      }
                  }
                  //Render the video capture into the
                  //Picture Box picCapture
                  picCapture.Image = currentFrame.AsBitmap();
                  // axWindowsMediaPlayer1. = currentFrame.AsBitmap();
                  //
                  ////string path1 = Value.ValueG._DataFilePath +
                  //"\\Video\\FaceFind\\Video" +
                  //Value.ValueG._CaseVideo_Id;
                  ////int fileCount =
                  ////System.IO.Directory.GetFiles(path1).Length;
                  ////lbl_FaceCount_Data.Text = fileCount.ToString();
              }
              //Dispose the Current Frame after processing it
              //to reduce the memory consumption.
              if (currentFrame != null)
              {
                  currentFrame.Dispose();
              }
              ////string path1 = Value.ValueG._DataFilePath +
              ////"\\Video\\FaceFind\\Video" + Value.ValueG._CaseVideo_Id;
              ////int fileCount =
              //// System.IO.Directory.GetFiles(path1).Length;
              ////lbl_FaceCount_Data.Text = fileCount.ToString();
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
          }
          finally
          {

          }
      }

This is the method I am using for processing the frame. How can I increase the size of the frame to upwards and downwards?

What I have tried:

I tried haarcascade_frontalface_alt_tree.xml to capture the frame and detect the face.