int main(int argc, char** argv)
{
IplImage* tmp_frame = NULL;
CvCapture* cap = NULL;
bool update_bg_model = true;
if( argc < 2 )
cap = cvCaptureFromCAM(0);
else
cap = cvCaptureFromFile(argv[1]);
help();
if( !cap )
{
printf("can not open camera or video file\n");
return -1;
}