Perhaps I can begin to answer my own question. Presumably I would use Studio One for the audio. But then also launch something like iMovie or the Apple Camera app for the video. Then, when finished, I somehow merge the two (in Studio One?) into a single video file. I guess they would sync based on time stamps in their respective files. Seems a bit clunky having to start and stop 2 different apps.
But am I on the right track? Thanks