Thnaks for sharing Luke. LOVE the the song!
i used shadowplay it comes as part of the nvidia experience software. basically you can set it up how you want but it records the last 20mins of the game and if you press alt+F10 it saves the into a mp4 file the start recording again.
You can change the resolution sound how long it records etc. you can also just set it to record straight to file but i found this eats up my hdd very quickly.