So, did it sound like that before the oil change?
How did it sound when you bought it?
Have you pulled the spark plugs?
The sound in the video strikes me as a serious mechanical event and maybe not too far from catastrophic failure. You either have some valve to piston clearance issues, metallic debris in the combustion chamber, or a piston rod bearing going bad. Unfortunately, none of these scenarios will get you back and forth to school and work for very long.
It's hard to discern exactly where the sound is coming from in the video but maybe if you have any luck on your side the problem is in the clutch...
Come and play.. Come and play...
Forget about the movement...!