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Photobucket videos are really hit and miss on my computer - yours doesn't work for me.
Wear points on the OM61X valve train =>
The rocker arms are held in place on their own system of towers that have rods running between them. The rods can wear nasty steps in them but I don't think this would necessarily result in seriously noticeable tapping unless the engine has suffered from top end oil starvation. In this case you'd probably see evidence of camshaft and follower wear.
You could (if you wanted) remove the rocker arm assemblies and feel for any movement there and in the camshaft. Most likely culprit if we're talking valve train / chain related would be the tensioner (in my book) but with out seeing / hearing the video nasty tapping always makes me think of the intermediate shaft bearing that runs between the timing device and the IP.
So I'd be removing the vacuum pump and checking for any obvious play in the end of the timing device. That would be my first port of call.
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