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Try Levels Effect
Generally, you can't. Once details are blown out, they're gone.
You can still have an image that is over exposed without the details being blown out. (although most likely that is the case in most instances)
That's why I said "generally". There are exceptions.
Of course ...but I wanted to point out that "over and under" exposure can also be a technique used by cinematographers / photographers and it is not necessarily a term that implies a "screw up".
In practise it would be rare that I expose an image as per light meter (ie. I over or under expose images - but with purposeful intent).
LEVELS is your friend...
I agree that purposely altering exposure is a valid artistic technique, but since the OP was asking how to correct it, that's probably not the case here. And in most cases (not all) where overexposure was unintentional, there's little or nothing that can be done outside of a reshoot.
It can't hurt to try the levels, and if it works, happy day! But if it doesn't, don't be surprised.
Having said that, there is another technique that might be tried if the footage isn't too bad. You can bring a clip into Photoshop and use the Shadow/Highlight filter. If you go to tv.adobe.com, click on Video Professional at the top, a segment covering how can be found callled "Photoshop for Video/Shadow Highlights Command".
But again, depending on the footage, don't be surprised if it doesn't work. Once highlight details are blown out, they're pretty much gone.
While we're on this, I'd like to give a bit of over-simplified advice.
Digital video is much like digital audio, you usually can't fix "clipping".. It's always better to record digital audio too low, because you can always bring it up. Likewise it's usually better to under expose digital video, as you can bring up more detail in post. It's a good rule of thumb in situations where you don't get any set up time. I usually let the camera set up the exposure, then I go to manual and drop it down a couple of notches.
It's always easier to fix dv that's too dark than it is to fix DV that's too light.