How to embed a non-qt c++ project (openglwindow) in a Qt quick project?

[Rozerin YILDIZ]

import QtQuick

Window {
    id: mainWindow
    width: 300; height: 300
    visible: true
    color: "darkseagreen"

    WindowContainer {
        window: openGLWindow
        anchors.centerIn: parent
    }

like this code I'm trying to embed non-Qt Quick windows. I create a non-qt c++ project, but i don't know how to embed it in my qt project. I follow this link: https://www.qt.io/blog/window-embedding-in-qt-quick (embedding non-qt quick windows) how can i do this?