Yes, but I'm not sure you can catalog all the features of the people you recorded and compile this into a real-time database that can be queried with relatively little oversight. I'm not a legal expert, but I suspect there would be both invasion of privacy (if private) and warrantless search/4th amendment/civil rights concerns (if law enforcement) concerns.
But nobody is being searched, and nobody is being recorded in private. The police and other organizations are observing what is plainly in public view.
An individual setting up a network of 200-400 cameras throughout a city would not be lega because of property usage I would assume. Not necessarily because of the recording. A llone person doing this would definitely raise more eyebrows.