With Continuity Camera, you can use your iPhone as your Mac webcam or microphone.
Use your iMac as a display with target display mode - Apple Support
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Top 5 Ways to Fix iPhone Camera Not Working as a Webcam on Mac
Use AirPlay to stream video or mirror the screen of your iPhone or
Make and receive FaceTime video calls on Mac - Apple Support
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Set up and use Apple Studio Display - Apple Support
Take and edit photos on your iPhone, iPad, and iPod touch - Apple
Control access to hardware features on iPhone - Apple Support
Camera not connected error. Please help! - Apple Community
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Continuity Camera: How to Use Your iPhone as a Webcam on a Mac
Use Switch Control on your device to control another Apple device