I want to capture frames of video. Do webrtc allow to capture frames of the user so, that I can use it for further processing
There would need to be alterations made to the existing module to support such a feature.
Something like insertable streams would allow such a thing a lot easier maybe?
But that being said 
There is basic support for video processors to allow the creation of effects.
You could piggyback on that and use it to capture frames.
Take a look at this pr, planned to be merged soon.
You’d have to either wait until it has been merged or use the forked branch if you want both Android and iOS support as currently there is only Android support.