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Non need for chroma key if the actor is on a floor. Locked off camera, thinnest wire you can find. 3mm steel wire works well – just be careful what you attach it too.
You use the shot of the empty floor you make sure you shoot before (or after) the actor does their travel. Then simply use the clear floor version as a mask and animate it to cover the wire, finishing at the actor’s body. As the body moves, gradually move the mask, shortening the section that is covering the wire. It’s only a short sequence, so even if it means you tweak a few tricky frames manually, it’s not the end of the world.