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You probably did not add the highgui library in the linker. Go to project settings, check for linker, and add the highgui library based on the OpenCV distribution that you have. If you are running OpenCV 2.4.8, it would probably be opencv_highgui248d.lib.

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You probably did not add the highgui library in the linker. Go to project settings, check for linker, and add the highgui library based on the OpenCV distribution that you have. If you are running OpenCV 2.4.8, it would probably be opencv_highgui248d.lib.opencv_highgui248d.lib. And in case you have not, please also add opencv_core248d.lib.