You can use the camera and microphone on an iPhone or iPad as a webcam for FaceTime calls and video conferencing on Apple TV.
You can set up a Add or remove user profiles on Apple TV.
Make sure your iPhone is connected to a power source, then position your iPhone near the TV in landscape orientation so that the rear camera faces you and you’re satisfied with the way you appear in the preview on your TV screen.
You can also press Use Apple Music Sing on Apple TV.