Inserting 3D modelling

I have a mobile application called augmented reality mobile application for try-on glasses but there is no 3D glasses on the application. There should be couple of 3D models that can track face on the app but I want it to look realistic. I will provide the 3D modelling on .blend and .fbx files. I will also provide the source code so you just need to insert 3D glasses model and track it on the face only. Thank you! Here I provide with the storyboard for your reference.