The getVideoTracks() method of the MediaStream interface returns a sequence of MediaStreamTrack objects representing the video tracks in this stream.

None.

An array of MediaStreamTrack objects, one for each video track contained in the media stream. Video tracks are those tracks whose kind property is video. The array is empty if the stream contains no video tracks.

The following example, extracted from Chrome's Image Capture / Photo Resolution Sample, uses getVideoTracks() to retrieve a track for passing to the ImageCapture() constructor.

let imageCapture;

navigator.mediaDevices.getUserMedia({ video: true }).then((mediaStream) => {
  document.querySelector("video").srcObject = mediaStream;

  const track = mediaStream.getVideoTracks()[0];
  imageCapture = new ImageCapture(track);

  return imageCapture.getPhotoCapabilities();
});