This takes begging to a whole new level.
I've seen some cockatiels get a little pushy when it comes to scritches, but this one definitely puts them to shame. He sounds like an unweaned chick asking for food. Then he proceeds to just push his head into the person's hand.
This is probably a result of just doing what the bird wants all the time, as the bird now doesn't take no for an answer.
I've always known cockatiels to be pretty funny with scritches though.