+1 -- If you have 30K miles and the car is still within 3 years of in-service TAKE IT IN. This is a known issue on the 2013s and should be fixed under warranty. I had the same problem and now the formerly-blurry camera is crystal clear.You can get a better camera from GM, but you'll probably have to pay.
On my 2013, during warranty, I had reported the poor quality and referenced a bulletin on it, and they replaced it with a better part number. Looks much better now.
If they give you a hard time, locate the TSB for it and bring it in. Oftentimes, a GOOD dealer with cover a known issue outside the warranty period.