This is an example of using Vuetify (v2.0.1) in a Symfony app. I created this app by loosely following this tutorial.
CAVEAT: I am not a Symfony developer and so I can't say with confidence that the organization of the files in this project is a good one or would be correct for a bigger project. At a minimum, though, it does provide a minimal working example of using Vuetify in Symfony. I was able to get it running locally on a Mac (High Sierra). Good luck!