Context2D and V-Sync

[Mark81]

Here:

http://doc.qt.io/qt-5/qml-qtquick-canvas.html

I read:

Rendering may also be synchronized with the V-sync signal (to avoid screen tearing) which will further impact pixel operations with Canvas.FrambufferObject render target.

Is there any example to do this?
I'm interested to synchronize the rendering in order to have smooth drawings.