While creating the Talktrack it is possible to move the video circle on the board, but this movement isn’t saved in the Talktrack. This would be a great feature so you can move your face to a place on the board and actually point to elements on the board.
One of the intro videos actually recorded someone doing this, making me think that is how it worked (but alas it was a video recorded on top of a talktrack playback). From a usability design perspective it is misleading too - it seems the video circle should be locked while recording so that it doesn’t deceive you into thinking that these movements are part of the talktrack.