Yep, as Amy says you can be filmed on webcam or any other way. I've never been asked for a video chat but if that happened I would direct them to my AW webcam link where they have to pay. I don't even show my face.
If they want to book an appointment for a meet they don't need a video call. Presumably they've seen your profile so all they need is a quick chat on the phone. Anyone asking for a video chat is wanting a free cam session in my opinion.