I normally use fraps but on this game it doesn't works, i tried camtasia but the framerate is very low. So what do you use ?

I personally use OBS Studio to record all of my PC runs. You can download it here https://obsproject.com/download . There are quite a few tutorials on Youtube that explain how to set up & use the program - lots of them are specific to speedrunning too, which should be helpful. OBS Studio has the added benefit of giving the user the ability to livestream their gameplay onto Twitch, too. Good luck!