You can, Red Epic does it with what they call HDRx, Magic Lantern does it with Dual ISO,
zcam E2 do it with WDR - all more or less the same things - you take two exposures for every frame. Doesn't always work for fast action, but for some shots it really helps. This is a really good blog post on the topic - https://medium.com/@jasonzhang_22759/wdr-of-e2-369a12d39a7f
Also, if your image bit depth is high enough, you can create "virtual" multiple exposures from a single image and do exposure fusion. Google already do this with HDR+ on stills.
The bit depth stored from the sensor could be a lot higher than the current 8bits most mobile phones use for video, if you have full control of the ISP. Cinema cameras can process and store 12-16bit video (Red, Blackmagic, Arri).
Even Apple does this to some degree with their "extended dynamic range" video on newer iPhones, though the saved files are still 8bit.
Also, if your image bit depth is high enough, you can create "virtual" multiple exposures from a single image and do exposure fusion. Google already do this with HDR+ on stills.
The bit depth stored from the sensor could be a lot higher than the current 8bits most mobile phones use for video, if you have full control of the ISP. Cinema cameras can process and store 12-16bit video (Red, Blackmagic, Arri).
Even Apple does this to some degree with their "extended dynamic range" video on newer iPhones, though the saved files are still 8bit.