How to modify Vuforia Configuration > Device Tracker > Track device pose ?

I need to implement 2 modes in my application, 1st with TrackDevicePose off and the other one will be



Positional with fusion mode Optimize for Model targets and ground planes.



Question: Is there a way to programatically (C#) turn this feature on/off in realtime or via changing scenes?
Cannot seem to find any examples of setting the config.

 

Step 1 Enable positional tracking by default
Step 2 Track State and enable/disable using the below.

Source

Code (CSharp):

1. PositionalDeviceTracker pdt = TrackerManager.Instance.GetTracker<PositionalDeviceTracker>();    
2. if( pdt != null && pdt.IsActive )
      
3. {
4.      //pdt.Stop();
5.      //pdt.Start();
6. }