Practically everything here can be accomplished in vanilla Arma. The only mods I made use of (which seldom appear in the video) are effects and sound based, ‚cept the chicken – that’s done by SLX wounds. Oh yeah, and the zombie. He’s from Undead mod.
The crazy vehicles are built in the editor using the AttachTo command.
Song is (a three times extended version of) Tea and Crumpets by Nal1200.