Hey!
I’m not aware of anyone doing this yet (I’ve read a lot of the forum posts).
I did want to highlight a possibly useful similar project by zranger1 where he made a different home automation integration for the Hubitat Elevation. This might be a jumping off point if you wanted to tackle this.
I made a video for the Websockets API and can see how that could be used to accomplish this. But if you didn’t want to code your own effects, and just wanted to reflect the content of an HDMI signal, it looks like some of the other Hyperion/Ambilight kits might be more straightforward. Or maybe you could just have the Pixelblaze render patterns when the video is off.