Your first paragraph makes me think strongly of The Dark Visions trilogy by L. J. Smith. This includes The Strange Power, The Possessed and The Passion. It's a series about 5 teens with gifts who are taken (at first willingly) to a house where doctors can help them learn to use their powers. There was the girl who drew the future, the boy who could heal, one who spoke to animals, one who was telekinetic and one who was a physic vampire. They soon learn that something isn't right and try to escape.
However, your second paragraph about the boy and the camera doesn't ring a bell in the slightest so if it was from the same series I don't think I have the right books.