Based on the frequency from the video, in person does it also sound like the ticking noise happens more than once, possibly multiple times per engine revolution?
Did it change at all when you took the cover off?
If you don't have a mechanic stethoscope I've found even a piece of wood or a broom stick can work like one in a pinch. Just put one end on the culprit area and the other end against your ear. (Obviously be careful where you place it on a running engine) Anyway, you move the wood around until you hear the sound the loudest to see where it is coming from.