I have had a Logitech C920 sitting on my shelf for over a year now and I just unpacked it to try it out. I thought I would try the Follow My Face feature out because I noticed it working on other users (Windows) systems during some Skype meetings. I am running OSx 10.14.6 and I installed the latest Logitech Camera Settings version 2.6.2. I opened Camera Settings up to find that Follow My Face doesn't seem to be supported. Any suggestions (Maybe another application?) to get that feature working for Skype and Facetime?
I'm surprised their own suite even recognises it - it didn't when the C920 was new…
From Logitech's C920 page
Windows® 10 or later, Windows 8, Windows 7
Works in USB Video Device Class (UVC) mode with supported video-calling clients:
macOS 10.10 or later
Android™ v 5.0 or above
So for anything other than Windows, there's no specific support, only as a generic 'UVC' device.
Many Mac users have complained about this over many years… as I got mine in 2012, I doubt it's anything they're going to be adding any time soon.
You can get a lot better than Logitech's basic support with a 3rd party app called Webcam Setting [$7.99] & though it can't do 'follow my face' it does make the camera considerably more useful. It also hasn't been updated in 5 years, but then neither has the camera.
It works well up to Mojave. I can't test on Catalina, but at least it doesn't get the "May not work in future OSes" warning at launch.