TheBrain might be doing something to render a browser page inside the app. Iām not sure if thatās possible in Obsidian, but I canāt imagine how to make it happen if the source app doesnāt actually provide a ārealā embed code.
For what itās worth, that looks like this:
<iframe width="560" height="315" src="https://www.youtube.com/embed/oHg5SJYRHA0" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>