added gpu::printCudaDeviceInfo to all samples

samples/gpu/opticalflow_nvidia_api.cpp

@@ -393,6 +393,8 @@ int main(int argc, char **argv)
         return result;
     }
 
+    cv::gpu::printShortCudaDeviceInfo(cv::gpu::getDevice());
+
     std::cout << "OpenCV / NVIDIA Computer Vision\n";
     std::cout << "Optical Flow Demo: Frame Interpolation\n";
     std::cout << "=========================================\n";