Since I can't read the article I can only go with story time here- my wife has cameras in her room and she loves them. Fights about 'who started it' are ended with the words, 'Ok, let's look at the video'. And when some little bully gets called on the carpet and their bullying parent comes in all set to steamroller administration with 'that's not what my child said happened why are you picking on them' the principal…
...justified by "solving" various conflicts in the classroom, conflicts that have root causes like large class sizes, social issues, stressful environments, overbearing parents, disrespected teachers or whatever - so we just build an panopticon?
Right now I can't even imagine watching surveillance video like that, seeing all kinds of reactions and emotions of people, of children interacting; what right do I have to systematically observe without them knowing?
Screw all of that. Spend any amound of money to have small class sizes, pay teachers better, make schools friendly and welcoming, have more counselors around or whatever.
But please throw out those cameras.