Advanced video behaviours most often require that you use Youtube or Vimeo API in order to control playback.
You can explore two other ways:
Webflow will take care of stopping a video if you use the Lightbox component. And it’s kinda making your popin too. You can try to hack the lightbox with custom CSS to make it look like a popin.
@Finsweet Attributes allow for playback control of a video when it’s in view or not, if it’s a bg video or an html embed video, NOT a YT or Vimeo video Attributes by Finsweet