I know this is an old post, but I have done this by placing a router in the garage thats bridged by wifi to the router in the house. I this plugged the NVR into the garage router. It works perfectly in case anyone else needs to do this type of setup. The routers by the way are both Apple extreme routers, but I'm sure any two current routers could be used in the same setup. Connecting the two routers in a bridge is called extending a network.
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