HDRI (High Dynamic Range Imaging) was originally used in 3D and is now frequently used in photography. It’s a process that merges several photos with different exposures, to capture a larger range of tones that the camera can’t capture in a single photo.
There are many photo examples found on the web if you simply type “HDR” on Google’s images search engine. Tutorials on this subject are numerous and you can see a great one here, that explains the concept, how to do it (with Photoshop for example) and with many beautiful photos as well. It’s quite simple if you have this software: Photomatix Pro.
Of course, some people are trying their best to apply this on video. The best example I found on Youtube: