Shoot in a raw file format.
The pixels in modern cameras’ image sensors can capture a wide range of light, but if you shoot in a format like .wmv or .avi that results in compression, you may lose a lot of that dynamic range. “If you’re shooting raw, you have a ton of information in that image,” Duchesneau says. “When you pull it into the computer, you can get back a lot of the image that you could see with your eye.”
Post-processing is your friend.
Tools abound to help you to get the images you want after you’re done shooting. As for adjusting the dynamic range of your video in post-production, you can learn to do your own colour correction and balancing with tutorials and experimentation.