Could you make video vocab for items that are more traditionally Japanese and less familiar to foreigners, e.g. traditional Japanese food? I got this idea while listening to audio blog S2 #2 which mentioned Japanese dishes such as "oden" and "motsunikomi", and I wish I could see what they look like, and what they're made of. I also remember that when I was studying abroad in Tokyo, I ran into many types of uniquely Japanese snacks, cooking ingredients, etc. whose names I had never heard of. Terms like "okonomiyaki" and "taiyaki" might be familiar to Japanese students, but terms like "chikuwa" might not.
This kind of vocab would be pretty specialized, so perhaps mostly advanced students would be interested, but I think they could further help students expand vocabulary, and learn more about Japanese culture and way of life. One major benefit might be that we understand more food items on the menu!