In a Blog Post Microsoft has talked in detail about HDR or High Dynamic Range Imaging (both photography and videography) capabilities of Windows 10 UWP platform. There are comparison sets in the post, that highlight the differences between normal vs HDR, image and video samples. But Windows 10 Camera app still doesn’t have HDR video capability. Microsoft has again failed in mentioning when can we expect HDR video feature in native Windows 10 Camera.

High Dynamic Range Imaging (HDR) is a technique that uses multiple exposures of the same shot in order to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The Universal Windows Platform (UWP) empowers you to build apps that take HDR photographs and videos, using digital compositing to overcome some of the limitations of standard photography and videography.
Here is what Microsoft has to say about enabling HDR video feature,
If your device supports it, HDR video using the HDRVideoControl is extremely easy to implement. You basically just need to enable it. This occurs in two steps. First, you must check to see if the HDRVideoControl is available on the device your app is running on. Then, set the HdrVideoControl mode to On. HdrVideoMode is an enumeration with three possible values: On, Off, Auto
It seems quite straightforward and easy implementation and it begs the question why this feature is yet not available on Windows 10 Mobile flagships like Lumia 950 and 950 XL.