void Start()
 {
     capturer = VideoCapturer.Create(source);
     capturer.Callback.OnVideoCapturerStarted += OnVideoCapturerStarted;
     capturer.Callback.OnVideoCapturerStopped += OnVideoCapturerStopped;
     capturer.Callback.OnVideoCapturerError   += OnVideoCapturerError;
     capturer.Callback.OnTexture += OnTexture;
     if (captureOnStart)
     {
         capturer.StartCapture();
     }
 }
 public void StartCapture()
 {
     capturer.StartCapture();
 }