This page covers the availability of Qt Multimedia features on iOS.
Since Qt Multimedia for iOS uses the camera, the Info.plist assigned to QMAKE_INFO_PLIST in the project file must contain the key NSCameraUsageDescription. Otherwise the application will abort on startup. See Info.plist documentation from Apple for more information regarding this key.
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https://doc.qt.io/qt-5.15/qtmultimedia-ios.html