Low oil level

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Adding to all the good advice; you are not the first one to experience this, mine weeped oil since i got it and i very much doubt if the cover was ever removed.
Just to put your mind at ease there is nothing concerning going on, here is a shot of my valve cover, it weeps all around, i just wipe it off once in a while, it certainly keeps any corrosion at bay, the cost and risk of removing the cover, taking all the parts off, replacing the seal and potentially ending up with the same situation is not a risk i would want to take, but we all have a different opinion and i certainly respect that;



Be aware that the bolts in the cover have m6 thread, a shoulder that stops the bolts from going too deep into the cam shaft bearings and the last thing you want to do is strip the m6 threads or break them off because the bearings are part of the head assembly, bored in line for the camshafts and are not a separate spare part, so it is not a matter of just tightening the cover bolts to increase the tension on the cover gasket.
In addition to that if the weeping is in all around the head it is unlikely that one of the bolts is loose........

Thanks for posting the video, it was very helpful in assessing the situation, well done.