Native Android and iOS Function for Face detection and tracking

Happy Monday guys,

I am new to the mobile side of UE4 (previously worked on the PC side). I have been trying to figure out how to get access to Android (and iOS) native functionality on the phone for face detection and tracking in the live video feed of the backside camera (only detection not recognition). Any thoughts or anybody done any work on identifying and tracking faces in the new AR template? I could obviously look at running some of the open source deep learning models but figured there has to be a way to access this natively in the actual operating systems?

Any thoughts/insight

/Mobile Newbie