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#1  

Yes. It needs to be trained. You would use "Object Recognition", not "Face Tracking" to train it (Face Tracking just detects that any face is visible. Object Tracking detects specifically trained things, including individuals).

You can also integrate to RoboRealm whose specialty is computer recognition and may do a more accurate job. One of our members, Justin, also built an add-on called EZ-Face that is specifically for recognizing faces, but that was before there was object recognition in EZA-Builder and I think he has stopped development on it and now recommends using ARC object recognition.

Alan