I will suggest you use opencv-python version 3.4.*. You are facing this issue because you are using some higher version of opencv-python.
You can download the correct dependencies using requirement.txt file present in the repository.
Hint: Use command sudo pip install -r requirement.txt
sudo pip install -r requirement.txt
That's work. But I think there's still something need to be done in order to eliminate noise in background.
Yes, that's an issue. You can take that up if you want.
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