What power does video/movies have?

As my profile states, I have a dream--a dream of producing movies or short videos that can invite others to think of how they can spread of peace internationally and/or be a motivator to put thoughts of peace into action. I am still doing a lot of research on this idea--for as briefly mentioned I believe that media has the power to create or destroy human interaction. Films can either show "them over there" in a negative, dehumanizing way or films can show the people of the world as human beings. What are the pros and cons of using films as a tool for trying to spread peace? What potential does film even have of making people want to change their lives? The film itself cannot not change peoples lives, the action must come from within and through the individual so can film even be used to influence peoples lives?