Not too difficult....
Buffon must be on a child background (usually green but it can be any color not used in the combination of both"videos"). The rest is video editing/synchro .
2 videos go in, 1 comes out!
this is the question: can "you" create the smoke by code?if you can create the coloured smoke
Sorry, as usual I was "not accurate"ah! that, my dear Luca, IS the question!