How to change brightness of a video on iPad or iphone?

It's extremely important that I can get this video brighter… Please help me

1. Open Windows Live Movie Maker. Click the "Start" button, "All Programs," and "Windows Live Movie Maker."
2. Insert your video into Windows Live Movie Maker. Move the cursor to the top of the window and click "Add Videos and Photos." Select a video and click "Open."
3. Adjust the brightness of your video. Click the "Visual Effects" tab. Go to the right side of the screen and click the "Brightness" link. Windows Live Movie Maker will then allow you to adjust the brightness of your video. Move the slider to the left to decrease brightness or move the slider to the right to increase brightness.

You can install "F.lux" software from apple store. It's free & most great think it track you GPS(Global Positioning System) location or you have to put it inside location bar. Your brightness will low or high against sunlight.
or
You have to low your brightness from your setting.

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