Only for Windows 10!
1. mpv player after 2019-10-31 can do direct HDR playback - use either SVP-provided build or shinchiro's build 20191102 or later.
2. VLC 3.0 can do the same but mpv's performance is better.
In both cases you have to turn on "Play HDR games and apps" or "HDR and WCG" (the name depends on the Windows version) switch in Windows Display settings first.
3. A workaround for MPC-HC + madVR: rename video file, insert ".hdr=on." tag somewhere in the middle. For example, "The.Movie.2019.mkv" -> "The.Movie.2019.hdr=on.mkv". Then madVR should do its job of switching display mode, etc.
播放hdr视频到hdr显示器