If it is, close it straight from the Activity Monitor.
You can check the Activity Monitor ( Command + Space, type “activity monitor”) to see whether one of those apps is running in the background. Check to see whether camera-based apps like Skype, FaceTime, Photo Booth, or another app is running either in the foreground or background and close any that you’re not using at that moment. One thing that’s quite easy to forget is that the camera can usually only be used by one app or program on your Mac at any given time. That option isnt there on my FaceTime 4 on High Sierra The option is available in Catalina. Related: How to Fix Webcam or Camera Not Working in Windows 10 Is Another App Using the Camera? If you’re having trouble with the Mac camera not working and using the built-in camera, try one of these quick fixes to get it working again. Photo Booth requires a FaceTime or iSight. Siri requires a broadband Internet connection and microphone (built-in or external). It is the second version of the operating system after the name change from OS X to macOS. Camera issues on the Mac are usually minor, and their solutions can be as simple as just shutting down and powering up your computer. macOS High Sierra is the fourteenth version of macOS, Apple's operating system for its Macintosh desktops, laptops, and servers. Don’t panic if your Mac’s camera suddenly stops working during a video call or if you see a “No camera connected” or “No camera available” error when you launch an app.
