OpenCV Simple GUI / QT

namedWindow("Photo", WINDOW_AUTOSIZE);
 
moveWindow("Photo", 520, 10);
 
imshow("Photo", photo);
 
resizeWindow("Lena", 512, 512);
 
destroyWindow("Photo");
 
destroyAllWindows();//

displayOverlay("Lena", "Overlay 5secs", 5000);
 
displayStatusBar("Lena", "Status bar 5secs", 5000);
 
saveWindowParameters("Lena");
 
loadWindowParameters("Lena");