We did something like sort of like this (same basice principle) on News Years Eve 1980-1981 @ Ft. Stewart, GA. Myself and another PFC got stuck on guard duty at the motor pool. So that day we stole a case of C-Rations from the supply room so we had snacks for the night. Not wanting to eat them cold we opened a few cans, rolled up some strips of cardboard about the same width as the cans depth, went out into the yard and drained some brake fluid out of a deuce & half, took the lids and folded the cut off can lids into U shapes. and set them on top of the cans with the cardboard & brake fluid sort of like so.
Of course that is a quick and dirty filed construction what this guy shows in the video looks to be a much better design in that it is more compact, transportable, and the fuel source is cleaner and much less messy.