How to bring live view of camera in C++ inside QT ?

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C++

QT

QT-Creator

I want to bring live view of camera in C++ inside QT.
I have tried the following code.
In the code below, what happens is that all the cameras connected to the laptop are shown in the combo-box, and then when we select a camera from the combo-box and then click on the Start button, the live view of the selected camera appears. But black and white live view comes. But I do not want black and white live view. What is to be done is that the original colors should appear in the live view. How do I bring original colors in live view???

What I have tried:

// This is my code from main.cpp file
#include <QApplication>
#include <QWidget>
#include <QComboBox>
#include <QPushButton>
#include <QCamera>
#include <QCameraInfo>
#include <QCameraViewfinder>
#include <QVBoxLayout>
#include <QMessageBox>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget window;

    QComboBox cameraDropdown;
    QPushButton startButton("Start");
    QPushButton stopButton("Stop");
    QCamera *camera = nullptr;
    QCameraViewfinder *cameraViewfinder = new QCameraViewfinder();

    // Layout for widgets
    QVBoxLayout layout(&window);
    layout.addWidget(&cameraDropdown);
    layout.addWidget(&startButton);
    layout.addWidget(&stopButton);
    layout.addWidget(cameraViewfinder);

    // Populate the camera dropdown with available cameras
    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
    foreach (const QCameraInfo &cameraInfo, cameras) {
        cameraDropdown.addItem(cameraInfo.description());
    }

    QObject::connect(&startButton, &QPushButton::clicked, 
           [&]() {
        // Get the selected camera
        int selectedCameraIndex = cameraDropdown.currentIndex();
        if (selectedCameraIndex >= 0) {
            QCameraInfo selectedCameraInfo = cameras[selectedCameraIndex];
            if (camera) {
                // Stop the current camera if it's running
                camera->stop();
                delete camera;
            }
            camera = new QCamera(selectedCameraInfo);

            // Set the viewfinder to the camera viewfinder widget
            camera->setViewfinder(cameraViewfinder);

            // Connect camera stateChanged signal
            QObject::connect(camera, &QCamera::stateChanged, 
                     [&](QCamera::State state) {
                if (state == QCamera::ActiveState) {
                    // Camera is successfully started
                } else if (state == QCamera::UnloadedState || 
                  state == QCamera::LoadedState) {
                    // Camera has stopped
                } else {
                    // Handle other camera states (e.g., ErrorState)
                    QMessageBox::critical(&window, 
                    "Camera Error", "Failed to start the camera.");
                }
            });

            // Start the camera
            camera->start();
        }
    });

    QObject::connect(&stopButton, &QPushButton::clicked, [&]() {
        if (camera) {
            // Stop the camera
            camera->stop();
            delete camera;
            camera = nullptr;
        }
    });

    window.show();

    return app.exec();
}