Webex IOS SDK rotate screen during video call

[vSolonets]

I'm using Webex iOS SDK for video call. And during video call self video is rotating from portrait to landscape. 
Is it posible to freeze video rotating?
Using 

defaultFacingMode = .user

And need to lock rotation to portrait.

[vSolonets]

@Raffaele Lagana 

In your example you just block all application to rotation. And what if I need some screen to rotate, and some block.

[Raffaele Lagana]

Our iOS SDK KitchenSink App sample should already be set to portrait mode through the below actions. I'm guessing you've built your own implementation from scratch and not following the KitchenSink App?

- https://github.com/webex/webex-ios-sdk-example/blob/5f927fb53581d93e31760bcca1a793db9489eb95/KitchenSink/Base.lproj/LaunchScreen.storyboard#L3 
- https://github.com/webex/webex-ios-sdk-example/blob/5f927fb53581d93e31760bcca1a793db9489eb95/KitchenSink/Info.plist#L47