setTopK method
Set the number of bounding boxes preserved before NMS.
topK
the number of bounding boxes to preserve from top rank based on score
https://docs.opencv.org/4.x/df/d20/classcv_1_1FaceDetectorYN.html#aa88d20e1e2df75ea36b851534089856a
Implementation
void setTopK(int topK) => cobjdetect.cv_FaceDetectorYN_setTopK(ref, topK);