The 7920 requires a GPU card for monitor hookup.  You need a graphics card good for 8k video editing, which can be Googled.  I Googled it myself, but can't stop at just one suggestion.  I'm sure the 7920 is more than up to the task of powering it.  But if you choose a card, be sure to check wattage and PSU requirements and check that against PSU wattage output.  That goes for any PC.

If you want, you can compare what's found in Google against the list of Dell validated cards for the 7920, which is in the attached spec sheet.