Delete the video represented by the ``video_id`` parameter.

def delete_video(video_id, cascade=False, delete_shares=False,
        _connection=None):
        """
        Delete the video represented by the ``video_id`` parameter.
        """
        c = _connection
        if not c:
            c = connection.APIConnection()
        c.post('delete_video', video_id=video_id, cascade=cascade,
            delete_shares=delete_shares)