0 A.D. has it's own YouTube gaming topic!
If you just want to watch some videos about 0 A.D. you can subscribe to that page.
If you create videos featuring 0 A.D. and you want them to show up on that page, be sure to:
include "0 A.D Empires Ascendant" in the title or the description or the tags and choose the correct game in the Gaming category of your video details. (Yes, the spelling does presumably matter)