Only Jews in a Rosh Hashana video? Say it ain't so! Next thing you know, we'll only have Christians in a Christmas video! "Those filthy hypocrites! Wishing people "Happy Holidays", but not having any non-Christians in their video! Who do they think they're fooling?"
As for promoting coexistence? Maybe if you'd watched and listened you'd have caught some of the lyrics which seem to do just that. "All ends with beginnings", "Let's raise the bar", "overcome" "We make mistakes / start anew, we can change / Take stock, search your soul / Shana Tov, time to grow", "stop all the strife", et cetera.
Moreover, you've got a bearded Hassidic Rabbi playing electric guitar with a bunch of young kids dancing to modern western pop music. I don't know what more you want to demonstrate that this is supposed to be peaceable, inclusive, and celebratory. Could you imagine something like this happening fifty years ago? Because I can't.