The belt vibration doesn't look alarming to me, and I wouldn't worry about a temporary absence of liquid build up in the crankcase ventilation (as long as all vacuum/ventilation tubes aren't blocked or leaking, the crankcase oil level is fine and the crankshaft oil seals aren't leaking...)
But the noise surely isn't right...
There's only one way to find out : take it apart and examine...
There are two bearings in the driven pulley (one roller bearing, one ball bearing) which might be worn out or running dry, there's a large spring behind the torquedrive (the moving driveface of the driven pulley) which could be broken, the torquedrive could have excessive play, the torquedrive could be sticking, not closing entirely, or not running straight...
There's a lot going on in the rear pulley assembly behind the clutch, it's probably the most important part of the CVT, and most people don't even know that those bearings and torquedrive should be lubricated...
Anyway, don't run it like this any more, don't even let it idle before you checked your driven pulley... If it's indeed the roller bearing in the driven pulley that's making this amount of noise, it must be so far gone that it might also damage the drive shaft..
