With a minor edit, the question would certainly be on-topic here:
Is Firefly the first Sci-Fi that shows the camera lens for video chat?
Your original version of the question could probably be argued either way, but this slightly changed version would be fine, a typical question under the history-of tag. I think it would also give you what you're looking for: if Firefly were the only one, then it'd definitely be the first one, and if it were the first one but there were others after it, then you might argue those were inspired by it.
(Personally, I downvoted this question. There's a lot of sci-fi out there, and it's virtually impossible that a simple idea like "realistic video chat" first appeared in a popular 2000s TV show. Even if I can't think of an earlier example offhand, to me this question falls into the same category as Was Harry Potter the first magic series to use wands? However, that doesn't change the fact that it would be on-topic.)