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well, you can't use GpuMat (or anything with gpu in it) without CUDA support built into the opencv libs at compile time

to achieve it, you'd have to

• have hardware, that supports CUDA
• get more recent opencv src (2.4.8 is very old)
• get a recent CUDA sdk (v 8.0, iirc)
• rebuild opencv libs from src with cmake -DWITH_CUDA=ON

opencv-2.4.8+dfsg1 looks like something very outdated, that you grabbed pre-built from some package manager. those versions are all "plain vanilla", and do not have any hardware support (apart from opencl, maybe)

well, you can't use GpuMat GpuMat, SURF_GPU (or anything with gpu in it) without CUDA support built into the opencv libs at compile time

to achieve it, you'd have to

• have hardware, that supports CUDA
• get more recent opencv src (2.4.8 is very old)
• get a recent CUDA sdk (v 8.0, iirc)
• rebuild opencv libs from src with cmake -DWITH_CUDA=ON

opencv-2.4.8+dfsg1 looks like something very outdated, that you grabbed pre-built from some package manager. those versions are all "plain vanilla", and do not have any hardware support (apart from opencl, maybe)