I'm not seeing the backup camera. So either it doesn't have one or they moved it to a little different position for that year. Odd, I thought backup cameras were standard.
And that's not a Nav unit - just a standard MyLink system. The "Navigation from Telematics" means that OnStar can send navigation directions to you. It appears in the DIC. But you'd have to have a OnStar subscription.
Again, I think you'd be best off to negotiate with the dealer to have it added. If it's simple and not too expensive, it should be easy to twist their arm. If they bulk, that's your clue. If the dealer can't do it, then you'd have to go a 3rd party route.