Fios Set top box and Media NAS

I had Fios installed a while back in my house and two of the four boxes they gave me are the Motorola QIP2500-3 models. Both of these boxes have an Ethernet port on the back of the box, I was wondering if I hook up these Set tops to my home network if I’d be able to play my videos from my HP Media Vault on the Tv using the Set tops.