Courts are currently wrestling with this.

https://www.oyez.org/cases/2017/16-402

> The government's warrantless acquisition of Carpenter's cell-site records violated his Fourth Amendment right against unreasonable searches and seizures. Chief Justice John Roberts authored the opinion for the 5-4 majority. The majority first acknowledged that the Fourth Amendment protects not only property interests, but also reasonable expectations of privacy. Expectations of privacy in this age of digital data do not fit neatly into existing precedents, but tracking person's movements and location through extensive cell-site records is far more intrusive than the precedents might have anticipated.

Or in United States v. Jones (cited in https://www.ca4.uscourts.gov/opinions/201495A.P.pdf):

> Although the case was ultimately decided on trespass principles, five Justices agreed that “longer term GPS monitoring . . . impinges on expectations of privacy.” See id. at 430 (Alito, J., concurring); id. at 415 (Sotomayor, J., concurring). Based on “[t]raditional surveillance” capacity “[i]n the precomputer age,” the Justices reasoned that “society’s expectation” was that police would not “secretly monitor and catalogue every single movement of an individual’s car for a very long period.”

It seems clear these cameras can hit some kind of threshold where they're common enough and interlinked enough to amount to unconstitutional surveilance. We don't know exactly where that threshold is yet.