Does someone know how to change WebRTC (<https://cocoapods.org/pods/libjingle_peerconnection>) video source? 

I am working on an screen sharing app.
At the moment, I retrieve the rendered frames in real-time in CVPixelBuffer. Does someone know how I could add my frames as video source please?
Is it possible to set an other video source instead of camera device source ? Is yes, which format the video has to be and how to do it ?

Thanks.