Cool! I think this kind of avatar embodiment is the future. I'm working on one that doesn't use the camera, but audio lip syncing to provide a good experience. https://jel.app
Also if you want an OSS alternative to any of these commercial tools, check out https://hubs.mozilla.com
+1 for hubs, I only found it recently and was positively surprised when trying it out the first time. It is missing the webcam-video-on-avatar function though, or it is well hidden?!
nope, never implemented it. you can share your camera but they are not avatar-attached. the theory being that we didn't want to implement that unless absolutely necessary, since it has a lot of tradeoffs.
Also if you want an OSS alternative to any of these commercial tools, check out https://hubs.mozilla.com