I thought the officer held his cool pretty well. The kid was being a dick. If you want to go around filming police, fine, but when an officer reasonably questions someone about being followed, either politely establish your rights-informing them that you mean no harm or interference, or explain that you are just collecting footage, give a reason if you so choose.
The officer shouldn't have threatened obstruction, because that doesn't fit, but if you following him around for no reason at all, that is stalking and is against the law. He would have arrested you for stalking if he'd thought about it. The officer's only reaction should have been to politely ask you to stop following him. But it takes two to create a tense situation.
Treat an officer no different than you would treat any stranger, their subconscious will force them to reciprocate. They consciously have to be a dick, you acting scared or overreacting allows them to continue the act. Not buying their act and treating them normal forces them to give up the act (unless their a Hollywood actor). Then you can reason with them just as you would anyone else. If they treat you terribly off the bat, treat them just as you would anyone else that treats you terribly.
"Tu ne cede malis, sed contra audentior ito."
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