It sounds awful.
I hope the video results in the daughter getting away from the parents and finding a better home. And, I hope the parents are charged with assault and child abuse.
But I then wonder about that second set of parents...they knew this was going to be aired--could it be they think this type of parenting is "normal" (not providing an excuse, just wondering why they would alow to be filmed if this type of parenting was normal behavior for them).