HDR imaging and HDR video are different techniques to produce more dynamic range. HDR imaging is compositing multiple images and using tone mapping to fit more dynamic range into regular image. If have a HDR display that can show the extra dynamic range, then don't need to do the tone mapping which tends to be the fake looking part.

HDR video is usually recorded with the higher range. Are there videos where high dynamic range is compressed into standard dynamic range? Or where HDR is synthesized from regular video?