What does that have to do with a binary search If a camera has AI on

You can have a AI do the actual binary search as described by the OP in his comment pic. Doesn't have to be a human being that does it, but the process would be done the same way by either.

My mentioning motion detection is just that an AI would be able to detect the moment of change in the video, the focus point more readily than a human being, is all.