You’ll soon be able to use an iPhone as a Mac webcam

I thought this was already built-in? My friend had a setup like this back in 2017? I guess he was probably using one of the various apps- a lot export in "NDI" format, which you can search for.

Less related; I bought a z-cam e1 off ebay a back, it has nice wifi streaming, but it's semi-complicated a protocol (make http requests to grab each frame) & no one has yet written a gstreamer or whatever plugin so we can easily v4l2 it back into a webcam. But there's plenty of other active & neat Video4Linux pipes & tools out there, to make virtual webcams with(e.g.: webcamoid[1])!

[1] https://github.com/webcamoid/webcamoid/wiki/Virtual-camera-s...