But its always better to roll out music that really fits than one that actually misses out the point. Now so many won't know the music came form that! You can maybe update the kickstarter page to include that.
On a side note, music is something that's universal to everyone. Something that we can use to connect with any other person on this earth! Have something really good or inspirational with less actual content in the video, it could still be a success! But if the background music isn't appealing enough, nor the product in the video no matter how great it is! (This is, of course, not the case with all!)