You can add the YouTube videos using blocks VD01 (one video), VD04 (displaying a video after you click the Play button), VD06N (two videos), VD08 (video and text), 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 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.