Man, it's going to be great when this gets adapted to make sure I'm looking into the screen at all the ads I'm required to watch, or when it complies a report of whether or not I'm paying attention to my boss in an all-hands...
Others are already trying to do this https://arxiv.org/abs/2504.06237. I haven't seen anyone take the approach I tried though, as most uses cases focus on tracking the main user rather than others around.
Article links to a library for that but says the licence didn't suit this project.