I have an application (audio player for http://vk.com) which uses OAuth 2.0 authorization. What i did was that i implemented QtWebEngineView object and used it to open an au
Yes, webengine can't be built statically. More info is here: http://lists.qt-project.org/pipermail/qtwebengine/2015-December/000264.html.
What you can do, is use C++ libraries (such as https://github.com/sirikata/liboauthcpp) for OAuth and add them to your project: http://doc.qt.io/qt-5/third-party-libraries.html. After that expose that to qml which is fairly simple: http://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html
That way you can create simple authorization page using QML and authenticate using underlying C++ library.