There are several ways. But the most efficient way depends on whether or not you have a premium account connect to your own domain (if you do, use custom element to set the style of the body & #SITE_CONTAINER to overflow-y: hidden!important; and pass a value to the custom element to remove this style once the video is done
. if you don’t - use setInterval(wixWindow.scrollTo(0,0), 20) and run clearInterval once the video is done, in the latter case the scrollbar will be displayed all the time you just won’t be able to scroll. In the first option, the scrollbar will be hidden during the video play time).
I already published several posts on the subject. Try to search the forum first.