I would be dumbfounded if any OpenWrt representative were to object to you using the OpenWrt logo on an OpenWrt tutorial video.
I came up with some alternative logos here:
Given observations that OpenWrt is not always used on wireless routers or even routers at all. But OpenWrt is so well-recognised nowadays it surely hardly matters.
@flygarn12 came up with 'Open Networking Technology' which is quite cool in that is has a three letter acronym.