Cannot preview in 16.04 desktop

In Ubuntu 16.04, camera-app (version 3.0.0+16.04.20160323.3-0ubuntu1) cannot preview webcam or capture anything, the camera-app window is all black.

From shell output:

user@desktop:~$ camera-app
Import path added "/usr/lib/x86_64-linux-gnu/camera-app"
Camera app directory "/usr/share/camera-app/"
unity::action::ActionManager::ActionManager(QObject*):
 Could not determine application identifier. HUD will not work properly.
 Provide your application identifier in $APP_ID environment variable.
Focus mode selection is not supported
APP_ID isn't set, the handler can not be registered
file:///usr/share/camera-app/ViewFinderOverlay.qml:23:1: module "QtSensors" is not installed
APP_ID isn't set, the handler ignored
QFileSystemWatcher::removePaths: list is empty

** (camera-app:3003): WARNING **: Unable to register app: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Invalid application ID
file:///usr/share/camera-app/ViewFinderExportConfirmation.qml:75:17: QML Item: Binding loop detected for property "height"
file:///usr/share/camera-app/ViewFinderExportConfirmation.qml:75:17: QML Item: Binding loop detected for property "height"
file:///usr/share/camera-app/ViewFinderExportConfirmation.qml:75:17: QML Item: Binding loop detected for property "height"
file:///usr/share/camera-app/SlideshowView.qml:43: TypeError: Cannot read property 'isSelected' of null
file:///usr/share/camera-app/SlideshowView.qml:375: TypeError: Cannot read property 'actions' of null
file:///usr/share/camera-app/ViewFinderOverlayLoader.qml:26: TypeError: Cannot read property 'settings' of null
file:///usr/share/camera-app/ViewFinderView.qml:458: TypeError: Cannot read property 'contentType' of null
user@desktop:~$