Alas, that's not how it works. Any video you could show of the laser experiment would also be faked. Even if you were to set them in front of the equipment, that'd be faked too. I often wonder as a thought-experiment what would happen if you bundled them onto a Musk style space tourism rocket and flew them to the moon to see the flag (for a bonus they can look back to see the spherical Earth) and then back, would they even then believe the conspiracy or their lyin' eyes?
(Then I catch myself on and realise it wouldn't even theoretically be worth wasting all that effort and money on someone so determined to be willfully ignorant. We live in a world where schoolkids can send a camera high enough to see the curvature of the Earth, yet we are to believe people who have made the denial of this a core of their identity do not see fit to replicate the experiment?)