It's not bad for $590 prebuilt. Should be fine for video editing and 720P gaming. Battlefield, Planetside and Skyrim should run ok on medium or high. I'd upgrade the video card whenever you get some spare cash though. Also, the PSU could probably due with an upgrade when you get a new video card. It's best to get one from a reliable brand such as Seasonic, Antec or Corsair. Other than that, it should be good for your uses. Intel CPUs are better, but the 8120 will suffice. 8GB of RAM is more than enough for gaming and video editing these days.
When you get money Get a better GPU (7870 is a nice gem) and a better CPU also later on FX-8350 is the top of the range if your motherboard accepts it.....(Check gigabyte's CPU support list and update your BIOS if necessary).