We looked into such capability in another piece of software for our business many years ago at the request of management. At the time, we were tasked with researching data loss prevention, security applications, and monitoring. In the limited time we tested such capability, we captured more than we ever anticipated. By the way, just snapshotting images managed to consume a lot of space as our employees had dual screens or more, all of which were captured-- however we stored all the images at a central location. The results not only scared executive management, also our Legal department, our Human Resources department, plus ourselves. It never got off the ground as an effort at our company.
This capability has problems and privacy issues written all over it.