2.4.7 - works for 64-bit.

Update: Pod now uses OpenCV framework downloaded from here:

http://sourceforge.net/projects/opencvlibrary/files/opencv-ios/2.4.7/opencv2.framework.zip/download

which supports 64 and 32-bit. Compiling for 64-bit didn't work, ran into same problems mentioned here:

http://stackoverflow.com/questions/18976893/how-to-compile-opencv-for-ios7-arm64