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In this line simply change deviceID to the name of your video file. Make sure it is in the same folder as the .exe file!

VideoCapture cap(deviceId); to VideoCapture cap("filename.avi");

In this line simply change deviceID to the name of your video file. Make sure it is in the same folder as the .exe file!

VideoCapture cap(deviceId); cap(deviceId);

to

to

VideoCapture cap("filename.avi");

In this line simply change deviceID to the name of your video file. Make sure it is in the same folder as the .exe file!

VideoCapture cap(deviceId);

to

VideoCapture cap("filename.avi");