Do you remember the case of the man who took the Police to court for filming him on Queen street and using their facial recognition - it went to court.
Link is here https://www.libertyhumanrights.org.u...uality%20laws.

The Police lost the case and were told to stop - I think they appealed - not sure what happened after that. I think they argued that there was enough legal framework to protect his rights.
There is also (I believe) nothing to stop them filming and then processing the video through facial recognition. They will argue it can be used to catch known criminals, terrorists etc).
On a personal level there is nothing to stop anyone from filming anyone else in a public space