how can i add a camera to my mac

Re: My camera dont work and my facetime app says i dont have a camera installed.

Learn what to do if the built-in camera won’t activate or appear in an app on your Mac

If the built-in camera isn’t working on your Mac - Apple Support

If FaceTime isn't working on your Mac - Apple Support

says

What to do: If your camera or microphone doesn’t work

How to: Choose a camera or microphone for FaceTime calls on Mac - Apple Support

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Re: how can i add a camera to my mac

If you have a compatible iPhone:

You may want to use: Continuity Camera: Use iPhone as a webcam for Mac - Apple Support

This Continuity Camera feature works with the following devices and operating systems,

using one iPhone and one Mac at a time.

iOS 16 or later

• iPhone XR or later
• (All iPhone models introduced in 2018 or later)
• iPhone 11 or later for Center Stage
• iPhone 11 or later (excluding iPhone SE) for Desk View
• iPhone 12 or later for Studio Light

and

macOS Ventura or later

• Any Mac compatible with macOS Ventura or later