Fog in Gear VR

Hey guys,

I just started with Gear VR, and to be honest don’t have a lot experience with Unity.
I am working on architectural VR project and thought to incorporate some areal perspective and fog. Reading some documentation on Unity and Oculus websites , my understanding this kinda things are expensive for mobile VR.
But there should be some kind of approach / cheating of the effect?

I was wondering how can I get these effects like Google made in their Cardboard Design Lab (Please sees attached images)?
Fog looks amazing!

Thank you,

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