Possibility to use camera as QR code scanner instead of taking photos

[saberraz]

In some cases, users want to scan a QR code and parse the content as a string to the form. It will be good to have an option to use QR scanner feature from the camera, in addition to photo taking.

Not sure, if this will need extending QGIS widget types??

[saberraz]

We can use a keyword (e.g. QRcode, qrcode) in the attribute table alias or field name to add the widget for scanning. The widget should be set only Text widget.