This is one of the Most Important Tutorials you HAVE to Learn in Sony Vegas! This Tutorial was done by howudoin52. From howudoin52: "This tutorial is showing you how to mask out a part of a video. It really isnt that hard to make. I haven't really seen it in many other videos but I think it is a pretty cool effect. In this video I used a sniper because basically all of the Call of Duty montages these days are no scoping montages with a M40A3. You can do this same effect with any guns.or ...