depending on your software, you can use it's built in brightness/contrast controls, but If you have no software (such as QuickTime Pro or Final Cut pro/express) You may need a different camera, or have some sort of lighting set up while filming.
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your movie is underexposed. there is no software that will fix it. adjusting brightness using software will not bring back the lost details, unless this was encoded from the source which retains the lost details. otherwise all you will acompolish is a washed out image by trying to brighten it.
what camera are you using (make/ model)? is this the original movie that you got from the camera? if you are using a digital camera or a web cam to record video thats your problem. when you say on your camera looked good do you mean on the viewfinder, an 1.5 inch LCD screen?
my movie.....too dark :( 
Linear Mode
