Is it required that the GoPro be controlled by HLT in order to overlay it?
I'm asking this for a couple of reasons. First, I'm running a road rally so there is only one "lap" and I don't want to screw up

Second, I want to record a few minutes before and after the lap. I believe I may be able to manually start the GoPro before starting (standinggo), but when I cross the finish line the video will stop (Maybe I could get around this by defining the finish as a stop/go?).
So what I'd like to do is have HLT record iPhone video to be used as PIP and have the manually controlled GoPro video be the main camera and overlay it. Is this possible?
Also, can the PIP video be shot in portrait orientation and overlayed in portrait mode?
Deven