Engerek01: I MANAGED TO MAKE IT WORK WITH OBS...

And the result is perfect, better than I could hope for. Here is what I did.

Installed Open Broadcaster Software v0.655b

Settings--> Advanced --> keyframe interval 4

On main page, Sources (right click) --> Add--> Game capture.
Start the game and go back to OBS immediately.
Application --> select your game. Click ok.
click Start recording.
Go back to your game.

And it worked wonderful. The best news is I recorded a 3 minute video on 1280x800 and it was only 13 MBs. That is really amazing considering other softwares made it approximately 1 GB per minute.

I tried making the "Use hotkey" but it didnt work for me. The game just didnt record. I would appretiate if someone could tell us how to make it work.

micktiegs_8: 1GB a minute? that's nuts!

I'll give you an example video from shadowplay. 9 minutes at 22MB/s total bit rate, 60fps @ 1080p.

1.5 GB file.

Engerek01: I cant use shadowplay because of my videocard but 1.5GB for 9 minutes is still huge. I just made a 30 minute video for only 250 MBs in 1280x800 resolution. So shadowplay's output is approximately 20 times larger than OBS's output.