I've used a Samsung DVD writer external with no problems on my Hikvision dvr as I used the DVS writer space for additional storage HDD this a link to a Samsung DVD writer unit if its of help
https://m.ebay.co.uk/itm/New-Samsung-8x-Slimline-External-USB-DVD-RW-DVDRW-DVD-Writer-SE-S084C/192627842398?epid=1905148408&hash=item2cd9839d5e:g:F-MAAOSw5UZY-I7r