[alkonaut]

This can vary between jurisdictions but in all jurisdictions i know, photographing someone in a public location is always legal and never requires consent. Whether publishing requires consent varies, in the normal case it does for commercial but not for journalistic purposes.

Note that laws written this way usually distinguish “taking photos” from “surveillance” - so mounting the camera on a street corner immediately changes the legal context. This may be why dash cams fall into the surveillance category in some places.