cvGetTrackbarPos  166 modules/highgui/include/opencv2/highgui/highgui_c.h CVAPI(int) cvGetTrackbarPos( const char* trackbar_name, const char* window_name );
cvGetTrackbarPos  216 modules/highgui/src/window.cpp     return cvGetTrackbarPos(trackbarName.c_str(), winName.c_str());