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There's an ld preload hack that is simpler and potentially lower latency than the loopback device: https://github.com/xkahn/camlink
There's this project [0] which turns a Raspberry Pi into a USB webcam. It works with the RPi IR camera.
[0] https://github.com/geerlingguy/pi-webcam
In the distance learning system I designed/integrated for the private school I teach at, we use these things to dump in video from a document camera (an "Elmo"--- Elmo TT-12) into OBS for compositing and then into Zoom. Some teachers have Chromecast, DVD players, etc, plugged into the video input on the Elmo, too-- it can be pretty amazing the different use cases you can meet with this cheap little toy.
(Details here https://medium.com/@mlyle_74064/inexpensive-telepresence-for... https://github.com/mlyle/ConfAutomation
Shameless self promotion: I create a from scratch implementation of a USB-MJPEG streaming server meant to run on low cost hardware. $10 USB web cam + a Raspberry Pi gets you a very simple nanny cam or similar.
https://github.com/ipartola/hawkeye