Play audio and video file using MVC

Use the HTML5 <video> and <audio> elements:
Using HTML5 audio and video - Web developer guides | MDN[^]

You'll need to make sure you have the relevant formats required to support different browsers:
Media formats supported by the HTML audio and video elements - HTML | MDN[^]

To load the video / audio file, you'll need an action which returns the file data:

public ActionResult Video(int id)
{
    var videoData = ...; // Load the bytes for the specified video from the database
    return File(videoData, "video/mp4");
}

<video controls autoplay>
  <source src="@Url.Action("Video", "YourController", new { id = Model.VideoId })" type="video/mp4" />
  (Fallback content for old browsers...)
</video>