opencv2 ios: undefined symbol "_OBJC_CLASS_$_CvVideoCamera"

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Trying the following tutorial: http://docs.opencv.org/doc/tutorials/ios/video_processing/video_processing.html#opencviosvideoprocessing

And I get the following error:

Undefined symbols for architecture i386: "_OBJC_CLASS_$_CvVideoCamera", referenced from: objc-class-ref in ViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)

Seen several similar posts, but all unanswered. Would greatly appreciate any help, thanks!