I would guess that's something from maybe Red Giant's many editing/Fx/colorist effects.
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You placed an orange color matte under your video clip. Converted your video clip to black and white and played with your Lumetri sliders to bring down your mid tones and brought your whites up so only your spectral highlights were pure white. Then used Ultra Key to key out only the things that were pure white to reveal the orange matte below.
Kind of looks like Focus Peaking.
I know right! That's what I was thinking when I saw it too.
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Glow Edges FX Factory Pro.
hi forum, thanks for your replies, and thank you Ann for the helpful insight.