Came across this on the r/selfhosted community. Still very much in the alpha stages, but it’s already got a Docker image you can try out for yourself, or try out the demo server.
Tried it earlier today, couldn’t get the voice/video chat to work right away on my self-hosted setup but the real-time chat was very snappy. Looks promising.
WebRTC is a thing. You don’t have to build all that from scratch. It’s very reasonable to piece together a lot of standard technologies to make this progress much quicker. I haven’t looked into this project, so I don’t know, but I know it was pretty trivial to setup a WebRTC app 10 years ago, which would appear to be a fully functioning video app.