Hi Marquito and welcome to our community
Yes, there is a resizing function built into Captivate.
Depending on your version, you click either:
For Captivate Version 1
Movie > Resize Movie...
For Captivate Version 2
Project > Resize Project...
Note that when all is said and done, Captivate is dealing
with images. Bitmapped images. So the resizing will likely have a
negative effect of making things look a bit on the blurry or fuzzy
side.
Cheers... Rick