Open the Settings app
Tap FaceTime
Turn on FaceTime if it is off
Start or join a FaceTime call
Make sure your iPhone or iPad is updated to the latest iOS or iPadOS version
Use a supported device that has FaceTime hand gestures available
In the FaceTime call, use a hand gesture in front of the camera to trigger effects
If gestures do not work, check that camera access is enabled for FaceTime
If needed, restart the device and try again