I've seen many posts over the years about Vuforia jittering in Unity3D. I've seen various workarounds, but none that I have seen (camera smoothing etc) have really been a very good solution.
This video looked promising https://www.youtube.com/watch?v=bcMiyTIa2HM but it is based on an older version of Vuforia where the AR scripts were separate from the Camera, so doesn't seem possible in V7.
Are you guys at Vuforia ever going to fix this problem? It is making my presentation look very amateurish :(