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It was shot with a Yi4k+ on a M5 Fotopro mini tripod. Recorded in 4K60fps in Medium quality.
Then uploaded to Youtube. Then downloaded the 2560x1440@60fps webm version from Youtube with winx ytd. And then uploaded this YT webm file from my computer to Viewly (4K webm was over 100MB limit)

Fantastic quality and the scene made my day...thank you, @pagandance. Is it possible to upload raw videos captured on an iPhone ?

I think it accepts everything, but you should ask @furion

I am a novist in shooting a video for online usage, so I will not even ask how it's done to confuse myself, but commendation is in order to the Steemian who did that video. Very good - woot, woot.