How to record video of recording part of the screen? I tried the MediaRecorder but can only record the whole screen.
Hello 
Did you search on the forum before posting ? 
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Sorry, I just flagged the first reply to your post as ‘spam’ since it obviously was, once again, from one of these bot buggers that for some reason think it’s smart to give ‘pseudo-solutions’ to our fellow members.
The answer above from @Tricotou should match your need. Else, let us know…
Meanwhile, have a great day 
I use an open source implementation of the project: https://github.com/bilibili/WebAV.I hope it was helpful