You can add the YouTube videos using blocks VD01 (Video), VD04 ("Play" button), VD06N (Video in multiple columns), VD08 (Text and video in two columns), VD09 (pop-up video), VD11 (Video with a custom cover), VD12 (Video and image in a row), VD13 (YouTube live stream with a live chat), VD14 (Video course playlist), VD16 (Video widget), AB701 (Title, description, and video), BF402N (Video or image and form in two columns), some gallery blocks, and also blocks with a fullscreen image as a background (
learn more about adding a video as a background).
To add a video, you need just a link to a video that is publicly available and enabled for embedding on third-party websites in the privacy settings.
Choose the block you like the most, go to its Content tab, and insert a link to the video.