C#

I have a program that does color tracking from webcam, my question is it possible to do this tracking also in a previously recorded video.

the code uses a combo box to tell which webcam to use the image:

VideoCaptureDevices videosource = new VideoCaptureDevices (videoDevices [cameraCombobox.selectedIndex] .MonikerSting);

the webcam image is played in the VideoSourcePlayer and a "newframe" event has the color tracking code.

but I wanted to play a video saved on the computer in VideoSourcePlayer, so yes activate the event "newframe", so I tried to put a url

VideoCaptureDevices videosource = new VideoCaptureDevices (@ "url");

the program did not raise an exception, however, nothing is played in VideoSourcePlayer and therefore, nothing happens.

Is there any way to play a video from the computer in VideoSourcePlayer? What can I do?

OBS: I'm sorry for the English of google translator.

videoSourcePlayer1.SignalToStop();
            videoSourcePlayer1.WaitForStop();
            videoSourcePlayer2.SignalToStop();
            videoSourcePlayer2.WaitForStop();
            videoSourcePlayer3.SignalToStop();
            videoSourcePlayer3.WaitForStop();
            // videoDevices = null;
            //VideoCaptureDevice videoSource = new VideoCaptureDevice(open.FileName);
            VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices(videoDevices[camerasCombo.SelectedIndex].MonikerString));
            videoSource.DesiredFrameSize = new Size(400, 300); //MUDADO de 320, 240
            videoSource.DesiredFrameRate = 12;

            videoSourcePlayer1.VideoSource = videoSource;
            videoSourcePlayer1.Start();
            videoSourcePlayer2.VideoSource = videoSource;
            videoSourcePlayer2.Start();
            videoSourcePlayer3.VideoSource = videoSource;
            videoSourcePlayer3.Start();

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