Seems like Youtube has changed the possibilities to embed videos on a WordPress blog like mine.
WordPress used to convert a youtubelink to an embedded video, and it was also possible to use iframe-tag in code to embed a video.
The four methods I tried below is not working anymore, the fifth does work. I might have a look at it later. In the meanwhile I recommend you watch the conversation between Walter Isaacson and Lex Fridman.
https://youtube.com/watch?v=aGOV5R7M1Js%3Fsi%3DDHDH2xy41IaAK2EC
<iframe width="560" height="315" src="https://www.youtube.com/embed/aGOV5R7M1Js?si=DHDH2xy41IaAK2EC" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
<iframe width=”560″ height=”315″ src=”https://www.youtube.com/embed/aGOV5R7M1Js?si=DHDH2xy41IaAK2EC” title=”YouTube video player” frameborder=”0″ allow=”accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share” allowfullscreen></iframe>