Although 2 cams, only one cam on each side of engine has a sprocket and a seal.
With that said? it is possible you have a cam seal leaking. can not rule that out however, changing a cam seal is a very big job, The timing belt ect is all removed, cam gear then seal
before one goes into all that work? I would lean to the more common which is the valve cover gasket. it is a one piece rubber gasket and can fail and leak
the diagram below shows the gasket as #4 shown
Book time is about 3 hours for the valve cover gaskets but much much labor and wok to change cam seals
I have not run into this engine wih failed cam seals to date. Not saying it is not possible. but is much more less common than valve cover gaskets
Sure , a bit of work for valve cover gaskets but not nearly like cam seals
the cams are not disturbed at all doing cover gaskets.Just upper intake and get to the valve covers and remove them to change the valve cover gaskets