Well as long as its here.
Many backs fit many different camera systems.
The Hartblei camera takes many diff kinds of digital backs so it should also take film backs - it's MF with Canon EF lenses, as many Canon lenses cover medium format or bigger than 35mm, such as the 17mm TS-E that does so still with movements without vignetting.
No MF digital backs do video.
See what the Fuji MF back fits on, its ~20mp, and it's the same tech as the S5 Pro, which means 14 stops, it's got that +2 stops of overexposure latitude.
There are also back adapters for various cameras.
The modelmayhem.com forums would probably get the most answers with people with experience with digital MF backs.