Comment 10 for bug 1500083

[code]
~$ kazam
Traceback (most recent call last):
  File "/usr/bin/kazam", line 149, in <module>
    from kazam.app import KazamApp
  File "/usr/lib/python3/dist-packages/kazam/app.py", line 36, in <module>
    from kazam.backend.prefs import *
  File "/usr/lib/python3/dist-packages/kazam/backend/prefs.py", line 30, in <module>
    from kazam.backend.webcam import Webcam
  File "/usr/lib/python3/dist-packages/kazam/backend/webcam.py", line 25, in <module>
    gi.require_version('GUdev', '1.0')
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 129, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace GUdev not available
[/code]

how to fixed the bug?