Does Zoom support video capture from devices like Elgato Cam Link on Android devices?

Not sure about those specific devices and PID/VIDs, but USB camera support for Android should technically land on Monday's release of Zoom Rooms 6.3.0:

Talk about convenient timing!

I would imagine that this will be somewhat buggy at first - please post here with your findings - very curious about what devices will actually be supported!

Again, you'll need to be running Monday's release, which generally comes out pretty late in the day.

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0061222

See Elgato's website https://help.elgato.com/hc/en-us/articles/360042390892-Video-Conferencing-With-Zoom

You will need to also check the camera compatibility list https://www.elgato.com/us/en/s/cam-link-camera-check

So it looks like the camera and capture device work together and the capture device will work with Zoom. The big questions is will the capture device work with Galaxy Tab A9+. If it all does connect keep in mind that Zoom video is only 640 x 360.