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Oil leak on 2006 Buick LaCrosse

I have an oil leak behind the upper pully for the cam shaft can you tell me what could be the cause.

Asked by for the 2006 Buick LaCrosse
Your engine uses a timing chain, there isn't a camshaft seal per say at the camshaft sprocket side of the engine. Oil seals fail over time and get brittle or the lip of the seal just wears. A build up of crankcase pressure due to a restricted PCV valve could cause seal failure but most likely just a fatigued seal or gasket is causing your leak.
Can you tell me about how much it will cost for meto have it fixed