I’ve translated 1.0 plugin to 5.0 source branch and was only able to get things working by setting Default RHI to Direct X 12.
I’ve managed to get both WebRTC and Fatal Error also, did a write up of my experience with AMD GPU here Workaround Pixel Streaming 1.0 on AMD: fatal error, EXCEPTION_ACCESS_VIOLATION, crashing, blank screen and "webrtc waiting for video"
Keen to hear if this solves your issue also.