When I scan a page with the AR app, the sound and video icons on the page flicker extremely so I can not touch them.
Sometimes the audio and video icons in the AR view on a book page flicker strongly. This can happen if the app does not clearly recognize a page, e.g. there is no image on a page. Or the whole page is designed with little contrast.
In such a case, try to keep the camera slightly farther away from the book page. The display of the icons will then mostly stable. It is common that at the beginning, when a page is recognized, the icons first "search" for their place, when they have fiddled with it, they also remain stable, even if you approach the page again with the phone.