Play video(video_id) now. This ignores the current play queue order.
        :param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
        :param playlist_id: youtube.com/watch?v=video_id&list=playlist_id

def play_video(self, video_id, playlist_id=None):
        """
        Play video(video_id) now. This ignores the current play queue order.
        :param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
        :param playlist_id: youtube.com/watch?v=video_id&list=playlist_id
        """
        self.start_session_if_none()
        self._session.play_video(video_id, playlist_id)