At about 12:45 it becomes apparent that it is not deadbolts holding the door in place. Could not see clearly, but my guess would be some sort of cross-bar. Pounding seems to have finally loosened whatever held it in place.
My favorite part was right at the beginning when the next-door neighbor opened his door, looked at what was going on, then closed his door. And yes, I'm wondering if his door is also as good as the one the cops were pounding on.
stay safe.