Change Eyewear Type from code

Hello everyone. 

My application currently uses a Video See-Through Eyewear Type with a generic cardboard.

However I would like it to be able to switch to normal mode when needed, because not everyone owns a cardboard at my school.

My question is, how can I change the Eyewear Type from inside the code ? I have a simple button that would switch the modes when pressed.

I tried checking the documentations but I can't figure it out. I know the DigitaleEyewearArController has a SetEyewearType method but how would I access it ? Do I have to create a new instance ? How would I bind it to my scene ?

This might look like a basic thing but I just started developing with Vuforia and I got stuck here. Any help is much apreciated.

Thanks in advance. Cheers !