Capturing Video from Web-camera on Windows 7 and 8 by using Media Foundation

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#ifndef OPENCV_GPU_EMULATION_HPP_
#define OPENCV_GPU_EMULATION_HPP_

#include "warp_reduce.hpp"

namespace cv { namespace gpu { namespace device
{
    struct Emulation
    {

        static __device__ __forceinline__ int syncthreadsOr(int pred)
        {
#if defined (__CUDA_ARCH__) && (__CUDA_ARCH__ < 200)
                // just campilation stab
                return 0;
#else
                return __syncthreads_or(pred);
#endif
        }

        template<int CTA_SIZE>
        static __forceinline__ __device__ int Ballot(int predicate)
        {
#if defined (__CUDA_ARCH__) && (__CUDA_ARCH__ >= 200)
            return __ballot(predicate);
#else
            __shared__ volatile int cta_buffer[CTA_SIZE];

            int tid = threadIdx.x;
            cta_buffer[tid] = predicate ? (1 << (tid & 31)) : 0;
            return warp_reduce(cta_buffer);
#endif
        }

        struct smem
        {
            enum { TAG_MASK = (1U << ( (sizeof(unsigned int) << 3) - 5U)) - 1U };

            template<typename T>
            static __device__ __forceinline__ T atomicInc(T* address, T val)
            {
#if defined (__CUDA_ARCH__) && (__CUDA_ARCH__ < 120)
                T count;
                unsigned int tag = threadIdx.x << ( (sizeof(unsigned int) << 3) - 5U);
                do
                {
                    count = *address & TAG_MASK;
                    count = tag | (count + 1);
                    *address = count;
                } while (*address != count);

                return (count & TAG_MASK) - 1;
#else
                return ::atomicInc(address, val);
#endif
            }

            template<typename T>
            static __device__ __forceinline__ T atomicAdd(T* address, T val)
            {
#if defined (__CUDA_ARCH__) && (__CUDA_ARCH__ < 120)
                T count;
                unsigned int tag = threadIdx.x << ( (sizeof(unsigned int) << 3) - 5U);
                do
                {
                    count = *address & TAG_MASK;
                    count = tag | (count + val);
                    *address = count;
                } while (*address != count);

                return (count & TAG_MASK) - val;
#else
                return ::atomicAdd(address, val);
#endif
            }

            template<typename T>
            static __device__ __forceinline__ T atomicMin(T* address, T val)
            {
#if defined (__CUDA_ARCH__) && (__CUDA_ARCH__ < 120)
                T count = ::min(*address, val);
                do
                {
                    *address = count;
                } while (*address > count);

                return count;
#else
                return ::atomicMin(address, val);
#endif
            }
        };
    };
}}} // namespace cv { namespace gpu { namespace device

#endif /* OPENCV_GPU_EMULATION_HPP_ */