setNMSThreshold method
Set the Non-maximum-suppression threshold to suppress bounding boxes that have IoU greater than the given value.
nmsThreshold
threshold for NMS operation
https://docs.opencv.org/4.x/df/d20/classcv_1_1FaceDetectorYN.html#ab6011efee7e12dca3857d82de5269ac5
Implementation
void setNMSThreshold(double nmsThreshold) =>
cobjdetect.cv_FaceDetectorYN_setNMSThreshold(ref, nmsThreshold);