Working on Motion Tracking

I’m not sure if this is the right spot. I tried to find a questions forum but didn’t really see one. I’m working on a project for my work, in which involves putting some of our employees heads on the football players from the Dirty Dancing Super Bowl Commercial. Unfortunately I go through the steps I saw in a youtube video about motion tracking and face swapping. But for some reason, some the clips I work with, the motion tracking doesn’t end up lining the image up, and I have to go and move the motion tracking points way off of the subject I’m trying to track. I’m trying to figure out if there is a setting I’m messing up. Basically the heads move but they don’t move enough to follow the action on the screen.