Speeches / The film "Exit Through the Gift Shop" about street art - Informative speech topic [2]

I have been debating on what type of topic I should inform the class upon. The professor let us have the freedom in choosing whatever we would like, and recommended the topic should be in ones interests.

Since I like movies, I choose the film "Exit Through the Gift Shop" about street art.

The problem is I'm not sure weather I should inform them about the film, or about street art itself.

I could explain the film, talk about the issues that arise in the film and so on...right?