It started out as being a means to send a video feed into OBS[1], which is how I rigged the webcam input, but as the project grew, it expanded to being a way for me to spin up desktop video and audio sharing in a browser, sorta like Zoom, etc. This let me run virtual movie nights with people remotely.
Whilst it's possible to use it via the 'create a room' interface, you can also do it all via URL parameters which I found much more flexible and robust. See here[2].
You create source and recipient URLs and then it just automagically makes it all work via WebRTC. I was able to for example make a source that captured my VLC window and sent out the video and audio, and then two destination URLs which received the source video and audio, but also sent their own audio to one another. This meant we could hear and watch the movie but also talk to each other via our microphones. All within browsers.
I've got no relation to this project besides thinking it's really awesome.
[1]: Used for streaming your computer online, e.g. on Twitch. https://obsproject.com/