cvDisplayOverlay   83 modules/highgui/include/opencv2/highgui/highgui_c.h CVAPI(void) cvDisplayOverlay(const char* name, const char* text, int delayms CV_DEFAULT(0));
cvDisplayOverlay  404 modules/highgui/src/window.cpp     cvDisplayOverlay(name.c_str(),text.c_str(), delayms);