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This header includes some code that nvcc doesn't understand (some intrinsic, asm part, etc). You can divide your code into two parts (cpp & cu). In cpp file you can use all opencv headers, in cu file you can use "opencv2/core/devmem2d.hpp" - lightweight wrapper for GpuMat

// cu file
__global__ void kernel(DevMem2D_<Type> mat)
void gpu_func(DevMem2D_<Type> mat)

// cpp file
#include <opencv2/opencv.hpp>
void gpu_func(DevMem2D_<Type> mat);
void func(GpuMat mat)

gpu module works in such a way.