That depends on how that tape was formatted. There are plenty [1] of articles [2] out there [3] on the use of digital video tape as a backup medium, if your tape happens to have been created through one of these processes you should be able to read it in a similar fashion. Instead of dvgrab these seem to use dvconnect, time to start experimenting I'd say.

[1] https://www.linux.com/news/using-camcorder-tapes-back-files/

[2] https://www.networkworld.com/article/2302563/using-a-camcord...

[3] https://www.linuxquestions.org/questions/linux-software-2/us...