A Flock camera isn’t an invasion of privacy. Fleets of hundreds or thousands of Flock cameras feeding into a massive dataset is definitely an invasion of privacy, and hardly sudden.
More precisely: pinpointing you at a given place and time does not need a warrant. Collecting many such pinpoints, allowing authorities to reconstruct your exact movements at some point in the future (without needing to flag you or issue a BOLO or whatever), does.