display a camera in Qt Quick
Unsolved
QML and Qt Quick
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It is very easy in QML.
You can have a look to the QML Camera example : http://doc.qt.io/qt-5/qtmultimedia-declarative-camera-example.html -
Here is a complete workshop explaining how to handle the Camera with QtQuick - in addition the demo project in github shows how to read QRCodes with QZXing :
https://forum.qt.io/topic/63838/qt-qml-workshop-materials/3