Check the camera permissions

  1. Click the apple icon in the menu and select system preferences

  2. Click Security and Privacy

  3. Click the privacy tab

  4. Select camera

  5. Select the checkbox next to an app to allow it to access your camera

Check for apps using the camera simultaneously

  1. Launch Activity Monitor from Applications

  2. Quit all other open apps or utilities that might be using the camera (e.g. Skype, FaceTime, and Photo Booth)

  3. If you’re not sure which applications might be accessing your camera, save your work and close all the open apps to rule everything out

Content & privacy restrictions

  1. Click the apple icon to the top left of your display

  2. Click System Preferences

  3. Click Screen Time

  4. Click Content & Privacy

  5. Click “Turn Off”

Use software update

  1. Choose System Preferences from the Apple menu , then click Software Update to check for updates

  2. If any updates are available, click the Update Now button to install them

Disable any audio or camera Apple extensions

  1. Click the apple icon

  2. Click System Preferences

  3. Click Extensions

  4. Go through all items on the left hand side and disable any extensions that has to do with audio or video

Some system extensions aren't compatible with current versions of macOS or might not be compatible with a future version.