Illegal is one thing, but more importantly: many people will not at all appreciate you filming them, though it's probably very much depending on where you are (

Illegal is one thing, but more importantly: many people will not at all appreciate you filming them, though it's probably very much depending on where you are (it's probably more accepted in tourist areas). Germany is actually relaxed regarding this compared to France, where you might really get into trouble for filming people without their consent.