Now I\'m testing ARKit/SceneKit implementation. The basic rendering to the screen is kinda working so then I wanna try recording what I see on the screen into a video.
Don't know if you have managed to answer this by now or not, but lacyrhoades, the person who wrote the class you referenced, has released another project on github that seems to do what you're asking for. I've used it and it manages to record the SceneView with AR Objects as well as the camera input. You can find it through this link:
https://github.com/lacyrhoades/SCNKit2Video
If you want to use it with AR though, you have to configure the ARSceneView to the project he's make, as his one just runs a SceneView, not one with AR.
Hope it helps.