It is good to ask before filming something or someone.
Carl is taking photos in a botanic garden which is full of visitors.
Carl wants to make a photo album for the garden.
Carl sees a woman staring at a bee on a flower and asks her if she can be her model.
Carl takes a photo of a beautiful tree while a woman is standing next to it and thus gets photographed by Carl too.
The woman feels interested and agrees to be photographed by Carl.
The woman, feeling offended, confronts Carl and asks him to destroy the film from his camera.