Oh, there are never stupid questions! How else can you expect to learn a new device if you don't ask?
Unfortunately, the answer here is that, with the stock camera/video-taking app on the iPad, there is no zoom. I've not needed to zoom myself, so I've not carried this too far, but - I believe there are some apps that allow you to zoom while in video mode. Hopefully, someone else will chime in who knows of any such app. Or, maybe do a Google search and see if you can find some that way.
Good luck and sorry to not be of better assistance.