[SnineT]

I think it's cam related, the knock isn't heavy enough for a rod.

But again it could be something that runs off of them like a brake pump etc that the actual breakage resides.

Get a longish bar or screwdriver and place it at various intervals on the cam cover and get an ear on the other end and see if you can detect where the sound is coming from area wise. mind yer hair or chains.

Do the same thing on what I think is the steering pump (front pulley wheel in the vid) again mind you don't get caught up on moving parts.

If you could shoot the white smoke it would help as well. Plus check the oil level to see how much isn't there anymore.