Using UE engine in existing xcode project

I have existing Xcode project that was builded on XCode 6 also uses iOS 8 or greater version.
Sp, there a few 3D simulation parts in app, these are made with another 3D engine.

I would like to port these simulation parts to UE engine.

I don’t want to implements other parts of my apps because these are displaying informations, forms etc.

After i created these simulation parts with UE engine. Is there any way to open these parts with some parameters from my existing UIViewControllers ? with video, texture etc ?

in same project of course.

Thank you.