Sounds like a fascinating idea, but I suspect a video will be unmanageably large. However, a relatively low resolution time-lapse would probably be sufficient.
You could sample say one screenshot every minute. It wouldn't take up too much space.
Those files will add up very quickly. On Linux I had screenshots for every click for months and the results were numerous enough to bring 'ls' to its knees
I think the idea was to analyze and cull at the end of every day
Well the goal was to make a video. The screenshots could be compressed into a single video file. At one screenshot a minute, and 24 frames per second; 24 hours of screenshots would give you a one minute video.