vuforia image reco

Hi,

I need a bit of help regarding vuforia image feed. I found on a forum info that we cannot feed vuforia with image from camera instead of live video feed. But at the same time I can see Vivono app which is featured on vuforias website which is using photos to get recognized and do specific action. https://engine.vuforia.com/case-studies/vivino.html

Any idea how it can be done?