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Basically this topic says it all.

OpenCV 2.4.4 is optimized for Kepler architecture GPUs. In version 2.4.3, only the GPU binaries are approximately 1.4 GB. So you can guess, that adding the code for Compute capabilty 3.0 and 3.5 would make this even larger. So it is not feasible to ship these binaries, and that is why the gpu folder is not present in version 2.4.4 prebuilt distribution.

SO basically this means that you need to build openCV yourself to have GPU functionality. Go to try that now!