message: add opencl option for resnet_ssd_face sample
diff: @@ -30,6 +30,7 @@ const char* params
  "{ model | | model weights (res10_300x300_ssd_iter_140000.caffemodel) }"
  "{ camera_device | 0 | camera device number }"
  "{ video | | video or image for detection }"
  + "{ opencl | false | enable OpenCL }"
  "{ min_confidence | 0.5 | min confidence }";
  int main(int argc, char** argv)
  @@ -62,6 +63,11 @@ int main(int argc, char** argv)
  exit(-1);
  }
  + if (parser.get<bool>("opencl"))
  + {
  + net.setPreferableTarget(DNN_TARGET_OPENCL);
  + }
  +
  VideoCapture cap;
  if (parser.get<String>("video").empty())
  {
  