Swiper only shows 1 slide with video instead of 3 - how to refresh swiper?

I’ve got a swiper with mutiple videos in it. Onload swiper shows only 1 slide instead of 3. Only when resizing the window, swiper shows all of the 3 slides. Is there a way to “refresh” swiper after all of the youtube Videos have been loaded in order to show up all of the slides?