How is looking process of making HDR movie?
After some searching I have get this link: https://photography.tutsplus.com/tutorials/what-is-hdr-video-3-ways-to-create-high-dynamic-range-video--cms-25884

According to this link and RED company's cameras:


No there are now multiple cameras which are recording the same scene
These special cameras records one shoot as 2 separate frames. First overexposed, second underexposed