Maybe, if they actually had to get a warrant. My understanding is that they don't need to do this for street cameras because there's no expectation of privacy in public spaces. But before massive camera deployments there was also an unstated expectation that there was some kind of cost to collect information on any particular person.

Still, one of the things to keep in mind about mass surveillance (or mass censorship) is that once the apparatus is built, policy can be changed relatively cheaply. And it's highly unlikely that law enforcement agencies are buying equipment that requires configuration changes to be signed by a court's or legislature's private key.