Reddit is an interesting animal. Your video should do better on smaller sub reddits that pertain to you video but still may do ok on the larger ones. I've learned to do some videos with specific groups of people in mind that I may never reach otherwise. Then using this, you can share to those people via subreddits that they are associated with.
(for example) I did a video on coffee in israel. It didn't do well on /r/videos but did fantastic in /r/israel or /r/jerusalem because it was still associated with them. Sure the latter two are not near as big of sub reddits as /r/videos but still gather attention, bring comments and feedback and, ultimately, views.