Gstreamer issue with declarative-camera example on Ubuntu 18.04

Application declarative-camera on native Ubuntu 18.04 does not show any image from the camera.

Notes: The declarative-camera examples works with this camera on Windows platform.  The usb camera works with guvcview on the Ubuntu platform.

To reproduce the problem, build and run Qt declarative-camera example.

• Camera application starts
• The view in the Camera application is black.
• In the Camera application, under the devices menu, the webcam is selected.

The application outputs:

"Unable to get the parameter value: the parameter is not supported.

(declarative-camera:26546): GStreamer-CRITICAL **: 17:43:55.475: gst_pad_get_current_caps: assertion 'GST_IS_PAD (pad)' failed

(declarative-camera:26546): GLib-GObject-CRITICAL **: 17:43:55.475: g_object_set: assertion 'G_IS_OBJECT (object)' failed

(declarative-camera:26546): GLib-GObject-CRITICAL **: 17:43:55.475: g_object_set: assertion 'G_IS_OBJECT (object)' failed
CameraBin error: "GStreamer error: negotiation problem."
CameraBin error: "Internal data stream error."