Back to the OPs post- the concerning thing is that parents disclosed cameras AFTER offer of employment. While technically ok- why not mention during phone or in person interview? This would have allowed a nanny to ask questions about how the footage will be used & stored.
If this is so common place in 2018- make it part of the discussion, early on.

Anonymous wrote:A lot of workplaces have cameras. If you worked at Target, you'd have cameras pointed at you all day. What's the difference?

They most CERTAINLY inform their employees and the surveillance. You should to.

Anonymous wrote:Team,

We watch our nanny like a hawk. Not that we don't trust her, but we want to make sure she is providing enough stimulation and is 'working'. Lazy Nannies need not apply.

How’s the turnover?