Is it ok to use the nintendo wii music as background music in one of my videos?

The usage of ANY music from the Wii hardware (like the Mii Channel OR the Wii Shop Channel) or games would be a violation of copyright... so Nintendo could legally strike down the video on any publicly accessible website.

While recreating the music track of your own accord (by doing your own instrumental version) would give you the copyright on the performance... Nintendo still holds their copyright claim on the original music, which complicates things in terms of copyright law.

On YouTube, Nintendo would automatically get a content ID claim on the video, so it would potentially get demonetized in the process.... but would be allowed to exist on it's own merits.

On Twitch, the usage of the music in the background would trigger a content / copyright ID claim & would mute the VOD for at least the duration of the music, but Twitch tends to mute in 30-minute blocks whenever a claim occurs.

In short (TL;DR) is that while it's not recommended if you're trying to make money on the video, Nintendo won't strike it down in full legal force on copyrights.

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Everyone does these days lmao

I'd advise against it. They would likely flag the video for that.

You can do it but they might give you a copyright claim

While Nintendo won't put a copyright strike on your channel and take the video down, they may put a copyright claim on the video and will take any ad revenue the video generates.

If you are a smaller channel that cannot monetize, then there really is no harm as you wouldn't make money either way.

The fact that Nintendo is using open source music in the game, I don't really know if they can claim their take on it as it's open source, so you may be ok.

Worst-case scenario, Nintendo puts a claim on the video. I don't think anything worse can happen. Either way, the video will be viewable.

EDIT: I was thinking "Wii Music", but if you mean Wii system music, then there is a higher chance of them putting a claim on the video, but I still don't think that they will take it down because of it.

no it isn't as it's illegal