How can I embed my mpv window in other application now?

qimgv uses libmpv for video playback support for example. I'm guessing that's not what you mean, but I'm struggling to think of how one might "embed" one application inside of another on xorg.

	▲	feverzsj 36 minutes ago \| parent [-]
		x11 supports foreign window embedding. You can embed window from other application into your own window. That's why lots of mpv/vlc based players/editors doesn't work probably on wayland. The only way to achieve this on wayland is writing a custom compositor for the foreign window.

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ijustlovemath 2 hours ago | parent | prev [-]

Probably with Special Window Settings (right click top bar of your mpv window)