HDR video needs to be processed or “Tonemapped” before it can be played back on a standard display. If the video is not tonemapped it will look gray and washed out.
Most popular video players will automatically convert HDR video to SDR, including:
VLC - Download from https://www.videolan.org/vlc/
Windows Movies and TV
- Playback of HEVC requires the installation of the HEVC codec from the Microsoft store.
Potplayer - Download Potplayer 64bit from https://potplayer.daum.net/