Vuforia front Cam

Hello,
I have a problem with vuforia and with the setting of front camera as default in my project for Android smartphones. I found in them on the “How To Use The Front Camera Device” https://library.vuforia.com/articles/So ice-Camera … but i don’t know how connect the c++ or java in the c# script. I am an absolute newbie and any help I would be very grateful. Is someone who knows how to set the front camera as default
Thank you very much
Remi

hi i have found it here
https://library.vuforia.com/articles/Training/Vuforia-Object-Recognition-Unity-Sample-Guide