I think many in that room would probably have liked to ask, "What is a 'webcam?'"

They were simply to shy to admit their ignorance!

...
I was under the impression that these laptops were assigned/restricted to a particular, public (school)room, where normal visual monitoring would be possible. That point may have been over-looked or I simply missed any words about this capability being used as in the linked article.

If this is done, in an open classroom, I see no problem, even with video. Anywhere else, even in the school building, could easily lead directly to invasion of privacy at worst or abuse at the least.