There is a difference between filming in public and private spaces. In most common-law jurisdictions filming in public is completely legal, even filming an eve

There is a difference between filming in public and private spaces. In most common-law jurisdictions filming in public is completely legal, even filming an event put on by a private entity (ie a sports game - there is no property in a spectacle). Note also the proliferation of CCTV in public spaces in many countries. On private property you have the right to set rules and effectively dictate who is welcome and who is trespassing. Hence you can't take a video camera into a theatre etc. There is a grey area when your public filming infringes on the reasonable expectation of privacy of another person. I doubt anyone here would take too kindly to a stranger following them 24/7 with a video camera.