hmm I see, so there's not a way to use both the camera controls and this script in particular..
thanks man!
It's possible that you press the "alt" key after starting the script, adjust the zoom, and then press alt again to return to the script when you are done changing the zoom.
The behavior of script when you do this isn't really well defined, but I think if you are just recording video, leaving alt briefly to manipulate canon controls would probably work.
edit:
I'm guessing you are using one of the "continuous video" scripts, if you can link to the specific script you are using, we may be able to provide additional help.