Video editing is a joke, any new(er) CPU will do(even 2012 FX's). Edit some video on your (old?) PC, it will likely be done immediately(or close too it). But for huge files the bottleneck will be the mechanical HDD. If you're dealing with files that amount to hundreds of gigs everyday, you'll want at least two 1TB SSD's. One read and one write.
Double check benchmarks of your favorite games. If they are CPU dependent an FX may score poorly. And be aware AM3+ is an old platform, a dead end. I can't recommend it in 2014.