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you could change line 160,

VideoCapture cap;                     // instantiate VideoCapture
cap.open(video_read_path);            // open a recorded video

to:

VideoCapture cap;                     // instantiate VideoCapture
if (video_read_path == "0")
    cap.open(0);                      // webcam
else
    cap.open(video_read_path);        // video from file