apparently, I have download the opencv2.framework from http://sourceforge.net/projects/opencvlibrary/files/opencv-ios/
but after I\'ve download the example project from
You don't need cap_ios.h.
You only need to #import in your prefix.pch file after you drag the "opencv.framework" file into Xcode.
#import
The GSOC opencv code is for some sort of development version.