It is nice of you to be there for your father. I'm sure this is very helpful for him :)
Being a "Ghost Hunter" may be making him more worrisome when he has bad dreams. Don't put the camcorder on him, it will just add to his problem. Just explain that we all have bad dreams, they don't mean anything, it's merely our minds way of cleaning house while we sleep. The less you make of this, the better. He needs reassurance that everything is fine, and bad dreams are normal. Maybe his doctor will prescribe something to help him fall asleep, or put a small TV in his room so that he can fall asleep while watching that, or suggest he read while lying in bed to take his mind off of the dreams. I think the camcorder will scare him even more.