I'm sorry to tell you this, but in video "Once it's white, it's gone." While you can take your footage into a color corrector and adjust the contrast and levels, and maybe get a tiny bit of the detail back, you can't reconstruct anything that is completely blown out, because the data is just not there, it was never recorded.
A good rule of thumb when shooting video is to always err on the side of underexposing your shot. It's very easy to get more details out of the dark parts of your video frame. It's nigh-impossible to reconstruct detail from over exposed video. So when in doubt, take the exposure down a little. (FYI this rule is reversed if you're shooting on film).
Also, as you're finding out the hard way, LCD screens are not the best judge of brightness. Some of the higher end camcorders have a Zebra stripe function, that puts a warning striped overlay on parts of the frame that are over exposed, use these if you have them. These rely on the camcorder's electronics, and not the LCD, so are very accurate. If your zebra stripes are set at 100, you can easily see which parts of your frame are so white that they're gone, and expose accordingly.
Sorry to be the bearer of bad news, but I do feel your pain. This has happened to every videographer at one time or another.
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JBÂ
John Burkhart
Editor-in-Chief
Videomaker