How to use default mission Manager

[atsumu-arch]

I want to use visual_tracking_manager.

I would like to receive advice on a specific implementation level.

The current situation is below.

on fusp/mission.py

class Mission(AbstractMission):
...............
   def on_activate(self):
      ...............
      self.get_manager("What should I put as arguments?");

What should I put as an argument in get_namager()?

The documentation mentions class_type.
What exactly is the value of class_type?

probably, from fsup.missions.default.flying.stage import FLYING_STAGE as DEF_FLYING_STAGE
Does this apply to items that can be imported with, etc.?
https://developer.parrot.com/docs/airsdk/general/default_mission.html#visual_tracking_manager.VisualTrackingManager:~:text=ある状態%20(たとえば、クリティカル/ランディングでは%20AutoLandingAlertsManager%20を使用)%20または別のマネージャー%20(たとえば、RthManager%20は%20AutoLandingAlertsManager%20を使用)%20でインポートして使用できます。