StreamCam
StreamCam provides a simple, uncluttered camera viewer that lets you use your iOS camera with your Mac.
Record to your Mac
StreamCam takes advantage of the built in screen sharing functionality between iOS and macOS.
Connect your device to your Mac via lightening cable and select it as a source in Quicktime. It provides you with a no-fuss, unobstructed view of your iOS camera that can be used in a variety of use cases.
Stream
Connect your device to your Mac via lightening cable and select it as a source in Quicktime.
Webcam
Use OBS or Ecamm Live plugins to create a virtual camera device which you can select as a source in Zoom, Skype, etc.
Visualiser
Use the "iPhone/iPad via cable" option in Zoom screen sharing to use your device as a second camera.