The sprocket and oil sling are right next to each other. The slinger looks just like the sprocket with as many teeth. The difference is the slinger teeth are blunt to where the chain will fit and even turn cam until a load is placed upon it. Now it is also possible you have a split sprocket to where it is now totally slipping but from the sound of your video it appears to sound just like the chain slipping on the slinger. Anyway you will need to pull the head and cylinder and using a small bright light, look into the case and inspect.
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