It is some kind of body glow, either blue or red with big 'chiaroscuro', everything else being black
that'd be mega helpful for me, you'd make my day :))
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You need a video editor that let you add curves to your video. Davinci Resolve is a great option.
Convert it to grayscale, you can simply reduce the saturation to 0.
Invert the curve. Augment the contrast making the curve more vertical.
Play a bit more. But that is the idea.
Option two for the final color is to add a color rectangle with different blending mode in the editor.