It is great to see a Christian movement recognizing slavery. I agree that prayer is crucial, but my guess is most people in the video are wearing clothes made by slaves. Most clothes and electronics that we all buy every day, are made by slaves, and are purchased with our own selfishness and vanity. Our N.American life-style is in fact fueling this slavery, and anything we buy made by slaves only promotes slavery to continue.
Let's also recognize the practical change we need to make in our own lives as well. Only through changing our life-stlye and prayer, will change happen. Faith without works is dead, works without faith is also dead.
Checkout my site: eco-christian.com

Great video production by the way. It looks amazing and communicates with style.