I don't know about the EU, but in the U.S. your statement is simply not true. Somebody absolutely can follow you around taking photos or videos, as long as you are in a public space and they can come up with any non-malicious excuse (i.e. it's an art project!).

Stalking laws vary state-to-state, but you generally have to prove it is specifically "for the purpose of harassing and intimidating".

See also: paparazzi

See also: http://www.victimsofcrime.org/our-programs/stalking-resource...