This statement was keeping HAAR cascades from leveraging opencl on nvidia...

This statement was keeping HAAR cascades from leveraging opencl on nvidia devices. "localSize" on the featureEvaluator remains Size(0, 0) which sets the bool "use_ocl" to false. Adding this allows NVidia GPUs to leverage opencl HAAR Cascades

modules/objdetect/src/cascadedetect.cpp

@@ -609,7 +609,7 @@ bool HaarEvaluator::read(const FileNode& node, Size _origWinSize)
     localSize = lbufSize = Size(0, 0);
     if (ocl::haveOpenCL())
     {
-        if (ocl::Device::getDefault().isAMD() || ocl::Device::getDefault().isIntel())
+        if (ocl::Device::getDefault().isAMD() || ocl::Device::getDefault().isIntel() || ocl::Device::getDefault().isNVidia())
         {
             localSize = Size(8, 8);
             lbufSize = Size(origWinSize.width + localSize.width,