I've had success using my iPhone for video capture via OBS. The setup was a bit fiddly, but still only took an hour-ish to try this approach by downloading and installing OBS, figuring out I needed a virtualcam plugin, finding it and fiddling w config, creating a dirt-simple "scene", and enabling it for use in Zoom. This is on an iPhone X (iOS 14.2), and Catalina (macOS 10.15.7).
I've had success using my iPhone for video capture via OBS. The setup was a bit fiddly, but still only took an hour-ish to try this approach by downloading and installing OBS, figuring out I needed a virtualcam plugin, finding it and fiddling w config, creating a dirt-simple "scene", and enabling it for use in Zoom. This is on an iPhone X (iOS 14.2), and Catalina (macOS 10.15.7).