@aricarai Yep. I use Windows Movie Maker.
As for OBS, it's pretty simple once you have all of the settings configured. I had to look up a couple of tutorials myself, but once it's set up all you really need to do is start the program, start your game, and when you're ready to record just press the hotkey you set for recording and then you use the same button to stop recording. The hardest part is just finding the right settings that work for you and your computer.
It does run in the background of the game, but I haven't had any problems with lag from it and I'm on a laptop that's not exactly ideal for gaming.