VideoOutput doesn't display anything with Software Backend / Renderer

Everything is in the title, the videoOutput QML type doesn't render anything.

You can test it with the Qt example "QML camera example" : https://doc.qt.io/qt-5/qtmultimedia-multimedia-declarative-camera-example.html

Just make sure you have a working camera and enable software backend with : 

qputenv("QT_QUICK_BACKEND","software");