Help with the camera on ThirdPerson

Well, i really like to make movies by putting a camera and filming myself killing zombies, i do it with fraps, but at 3rd person i cannot aim accuratelly

so i would like to know if there is a way to me to act in 1st person while fraps get film the game in 3rd person

i think that maybe something about the record console command
but i don’t know how to use it…

thanks for the attention (sorry for my bad english, i’m from brazil)