Hi @rajank11
I think @JDRoberts beat me to it on both speed and depth…but I’m sure thats a good thing.
However nobody said anything about official…Just “Works with” just saying. 
The way I did it was to set-up IFTTT nestcam triggers for motion and then had that switch on a momentary virtual switch in smartthings indicating motion as an IFTTT action. that can then be used as a trigger for other apps in ST.
FAQ: Creating a virtual device
You can also integrate the camera directly with ST via Nest Manager
Nest manager 3.1
Depending on how you want to view your nest cameras it’s not “official” but it does work very well