I spent a few days this summer determining how to integrate OpenCV with the Qt framework (for a forthcoming project). Figuring I might be able to save others attemting to do the same a bit of anguish, I've shared the source. You can get it at
github. If this is all Greek to you, I apologize. You still may be amused by a
video in which I lay my dignity on the line to demonstrate what one can do with Qt and OpenCV.
If you want to try it out yourself but aren't up to building from source and you happen to have a mac running OS X v. 10.6 with a built-in or attached webcam, you can download and run
this app bundle.