def find_by_campaign(campaign_id, _connection=None, page_size=100,
        page_number=0, sort_by=enums.DEFAULT_SORT_BY,
        sort_order=enums.DEFAULT_SORT_ORDER):
        """
        List all videos for a given campaign.
        """
        return connection.ItemResultSet(
            'find_videos_by_campaign_id', Video, _connection, page_size,
            page_number, sort_by, sort_order, campaign_id=campaign_id)
List all videos for a given campaign.