This video is titled "Aerobatic pilot Melissa Andrzejewski flies under highliner Sketchy Andy Lewis and freestyle motocross legend Jimmy Fitzpatrick in a first of its kind aviation stunt." There's not much else to say other than take a deep breath and watch it!
There's no CGI here: these are professional daredevils who are incredibly well trained in their fields with nerves of steel. I wish there had been something this good in any of the recent James Bond movies.
And as if I needed to remind you, do not try this in your backyard.