modded cutscenes

This Mod Changes Now Just 14 Cutscenes (End Game,Clam Baking,Operation Voodoo Drop,Back For Seconds...,The Great Escape,Blind Date,Absence Makes The Heart Grow Fonder,Checking Out,Requiem,General's Orders,Old Friends, Older Enemies,The Coming Storm,Big Problems in Little China,An Amazing...

Can Someone tell me how to mod and edit cutscenes in saints row 2, i've seen masakoteam and mrsaintsgodzilla21 do it before, so how do i do it??