Within the latest version of MacOS a feature called Reactions was added.
Reactions adds effects to the camera's video when certain gestures are performed.


More information is available on Apple's page https://support.apple.com/en-gb/HT212950
Turn off the Reactions feature
- Open your camera app: Start up any app that uses your camera, like Photo Booth, FaceTime, or during a Healios session.
- Look for the green camera: At the very top of your screen, you'll see a menu bar. Find the icon that looks like a green camera and click it.
- Toggle Reactions: In the menu that pops up, you'll see the word "Reactions." Next to it is a little button. Click it to turn Reactions off (it'll change from green to grey) or back on again (green means they're active!).

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