Update README.md: added example how to use web-cam

Alexey

2016-12-10 cf29681a5040bf4114672181cd18609065d3a3ef

 src/cuda.c

@@ -26,6 +26,7 @@

void check_error(cudaError_t status)
{
    //cudaDeviceSynchronize();
    cudaError_t status2 = cudaGetLastError();
    if (status != cudaSuccess)
    {