Below, a touch sensitive button on the front of the webcam's face adjusts between 3 brightness levels for the ringlight feature for optimal lighting levels for your selfie stills or video capture. It's location may not be ideal though as touching the camera head to adjust brightness can all too easily bump it out of alignment.
Note the OSX 10.6+ 1080p HD autofocus webcams include a built-in microphones, H.264 video compression and a standard thread tripod camera mount hole in the clip base for those who'd prefer the stability and positioning control tripods can give you.
The UVC - USB Video Class device specification is firmly entrenched in the low-level software code of all major operating systems: Not just OSX, but Windows, Linix and Android OS as well. As such we expect that vast majority of more recent UVC compatible web cameras to work on the 10.15 version of Catalina MacOS without a hitch.
If there's any quirks about MacOS Catalina webcam compatibility, we'll note it on this website. As more app developers and end users deploy their webcams under the Beta and full release of Catalina we'll be sure to hear of particular cameras that exhibit any problems or issues.
There may be much older web cameras with outdated UVC device implementations that aren't up to snuff and may be problematic for use on MacOS Catalina, However most modern webcams should work on a Macs running Catalina just fine.