Recreating YouTube’s Ambient Mode Glow Effect

I noticed a charming effect on YouTube’s video player while using its dark theme some time ago. The background around the video would change as the video played, creating a lush glow around the video player, making an otherwise bland background a lot more interesting.This effect is called Ambient Mode. The feature was released sometime in 2022, and YouTube describes it like this:
“Ambient mode uses a lighting effect to make watching videos in the Dark theme more immersive by casting