Yeah, in order for this to be usable, it would need a better UI. Maybe some kind of overlay: it could automatically position the annotations at the correct posi

Yeah, in order for this to be usable, it would need a better UI. Maybe some kind of overlay: it could automatically position the annotations at the correct position relative to the video, and make them appear and disappear at the appropriate times. I wonder if implementing something like that would be technically feasible.