The live webcam does not exit and produce out on keypress

[delebash]

Windows 10 Python 3.7.7

In the video_demo.py file after I run it and it is recording from my webcam I cannot close the window. From code I think it is cv2.waitKey(1). I tried various version such as specifying a specific key pres for cv.waitKey but I still had to shut down from killing the command line and no output was produced.

[cleardusk]

It seems to be the opencv problem, not the repo. You can check the code logic and find if there exists some dead-loop. Honestly, the graphic system like opencv or other renders often crash on my macOS : (