Yes, the most basic Macbook still comes with a Combodrive. This reads DVD-ROM, but only writes to CD-R/RW.
The Superdrive is in the rest of them, that also burns to DVD too. It does say this on the Apple Store website, or in a physical Apple Store. (Though I do agree that no laptops should come without DVD writing abilities now.)
Do this:
Click Apple logo (top left) -> About this mac -> More info...
Click "disc burning" on the left.
It'll show you just what it can and cannot burn to.
What does it say?
(Unfamiliar with iMovie, but you could always burn to SVCD. For a regular TV, hardly any difference in quality probably.)