How is it running? Is it missing, underpowered, throwing codes, hard starting, or running with less than all its cylinders?
I ask because the noise almost sounds like something superficial to me. For example: a bolt that has loosened on a pulley slapping a cover or other engine part. It's really hard to tell from a video, though.
Either way, I wouldn't run it anymore until it has been diagnosed. No sense in doing more damage and costing more $$. I'd have it towed to your mechanic.
Did you drop the oil and check for metal yet?