I've always thought there was too much fuss about CCTV cameras here in the UK, people spout on about it being an invasion of privacy that they are "being watched" but are ignorant of what is IMO a far worse invasion with data collected from online activities.
The broken nature of CCTV coverage (not everywhere is covered and to get the 'full picture' of someones activities you would need to be in law enforcement and get warrants for various companies own CCTV footage) and that storage of video is more of an issue means that with CCTV the eponymous "they" might be able to figure out where you've been and what you were doing.
The kind of information it's possible to gather from metadata and a little research online though could probably glean where you go, where you live, what you buy, who you contact and what you think.
