Is it possible to track the user's face with the front camera while rendering a scene with the back camera?

Hi everyone, I’m trying to look into whether or not I can track the user’s face using the front camera (for the purpose of user input via blinks, winks, etc.) while have the AR scene rendered with the back camera? Does this make sense? And is this possible? I haven’t seen anything supporting this yet but I think this could make for a great experience.

Unfortunately, It’s not possible to get both front and back cameras simultaneously.