You can try using one of the analytic things that heatmaps make.
They give a visual indication of where people click on the site, and I think some may allow you to track where the cursor is.
It’s about as close as you can get to what you want - there’s no way to keep track of what someone is watching,
, Google Analytics . , , , - . clicktale, :
http://www.clicktale.com/