While iOS does not allow you to turn off the flash light while recording video, it is possible to do that by installing the jailbreak tweak that we are about to tell you. There is this jailbreak tweak called “Record n Torch”.
Compatible with iOS 5, 6, 7 and 8, the Record n Torch tweak allows you to turn on or off flash light (torch) while recording video. Using a drag gable button (iOS 5 & 6) or a native button.
The Record n Torch is a part of bigboss repository and can be downloaded for free. The only requirement is a iPhone with jailbreak.