C#

if (capture == null)
            {
                try
                {
                   Image<Bgr, byte> capture1 = new Image<Bgr, byte>("1.GIF");
                  //  capture.QueryFrame();
                    VideoWriter v = new VideoWriter("output.mp4",-1, 1, 1920, 1080, true);
                    v.WriteFrame(capture1);
                }
               catch (NullReferenceException excpt)
                {
                    MessageBox.Show(excpt.Message);
                }
            }
            #endregion
            if (capture != null)
            {
                if (captureInProgress)
                {
                    //if camera is getting frames then stop the capture and set button Text
                    // "Start" for resuming capture
                     button2.Text = "Start!"; //
                    Application.Idle -= ProcessFrame;
                }
                else
                {
                    //if camera is NOT getting frames then start the capture and set button
                    // Text to "Stop" for pausing capture
                     button2.Text = "Stop";
                    Application.Idle += ProcessFrame;
                }
                captureInProgress = !captureInProgress;
            }