code: def subscribed_tracks(self):
          
          if self._subscribed_tracks is None:
              self._subscribed_tracks = SubscribedTrackList(
                  self._version,
                  room_sid=self._solution['room_sid'],
                  subscriber_sid=self._solution['sid'],
              )
          return self._subscribed_tracks
docs: Access the subscribed_tracks
  
          :returns: twilio.rest.video.v1.room.room_participant.room_participant_subscribed_track.SubscribedTrackList
          :rtype: twilio.rest.video.v1.room.room_participant.room_participant_subscribed_track.SubscribedTrackList