The humanity of art.

I just recently watched a movie where the main antagonist froze people in time and put them on display as art objects. The main people she froze were serial killers who were famed for their murders and violence. She claimed that their violence and emotions made them art. She believed that the acts that they committed made themselves artists, much like a performance artist. She claimed that by creating their artwork, they themselves became art that she wanted to take. This raised an interesting question in my mind:
Can a human be an art object?