BTW, I've been through similar with an elderly relative recently.
They lived alone, and every time they didn't answer the telephone it was a worry, even though they were just out shopping.
There could have been quite a temptation to install cameras, maybe just in the kitchen, to see that they were up and about and OK. But they're very independent and private, and even daily phone calls made them feel a bit crowded.
And this is a common problem - to the point that as a compromise between privacy and safety, and with the consent of the monitored person, you can install a surveillance system of pressure mats and door monitors which keep a record of activity. But even then, we didn't want any in the bedroom or bathroom: it's none of my business what time they get up or how often they wee in the night.
In fact the person can no longer live alone, so we didn't install. But although remote-access cameras would seem to be a "solution", they just wasn't. Because this was an adult who expected privacy.
The nursery issue isn't just a "children and cameras" question (although some children do indeed have security issues), it's a "people and cameras" question.
The proposed mass-access CCTV of nurseries isn't just you watching your child, it can be the creation of a permanent digital film of hours and hours of the 3-year-old self of the 30-yr-old who is now a teacher, or bank manager, or footballer, or witness in rape trial. Posted on the internet for Da Lolz by SaddoHacker and found years later by, well, anyone, thanks to the wonders of Google and, increasingly, Facebook's face recognition software.
That's why it's not like professional CCTV that doesn't leave the building.
We've never lived in this world of zero privacy, because it's only just coming into being and didn't capture the childhood of anyone adult today. We don't know what it will be like. It may be benign. It may not.