Hello,
Betaface works only with photos?
I'm searching a way to recognize faces without need to take a picture. Any way to accomplish that?
Yes, it works with photos (documentation here). Usually, you'll need to either take a photo (or eventually a video in some other APIs) for these systems, as access to the camera is restricted (assuming your question is about mobile apps).
iOS Face ID API may let you authenticate your user by using a specific API though.