Opencv 3.4 detectMultiScale with ocl not performed on GPU

edit

Hi I am using the following version of detectMultiScale with ocl Mat to run it on the GPU:

cv::UMat oclMat = img.getUMat(cv::ACCESS_READ);
double scaleFactor = 1.05;
std::vector<cv::Rect> objectRects;
classifier.detectMultiScale(oclMat, objectRects, scaleFactor);

This worked fine for me with opencv 3.2, 3.3, 3.3.1, but changing to opencv3.4 it suddenly is run on the CPU only. Did the API change?