BirdTV is an Apple TV app made for doorbird door intercoms. See https://www.doorbird.com/
***IMPORTANT***
BirdTV supports streaming of the video, opening the door (if connected), switching on the IR light and browsing History images. Talking to the person at the door or hearing them is not supported yet as doorbird did not release this possibility yet. On top of that the AppleTV microphone on the remote is not yet available to developers.