The EventNotifier instances are registered with the event dispatcher instance of the CameraManager. This makes it impossible to use event notifiers in other threads. Fix this by inheriting from Object, which allows binding instances to a thread, and register them with the event dispatcher for the thread they are bound to. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>