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obsninja
VDO.Ninja is a powerful tool that lets you bring remote video feeds into OBS or other studio software via WebRTC.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I'm not 100% this is the right tool, https://jamulus.io/ but something fitting your needs was covered in a 2nd hour of office hours a few months back. https://officehours.global/
If something like VDO.ninja or any other P2P style video conferencing can't achieve suitable latency, then just maybe some audio only p2p could cut it. Maybe things like. https://github.com/gasnew/cedar Or maybe some of these. https://github.com/omarcostahamido/awesome-networked-media#audio-networking