I run a small Michigan based company called Welcome to this World Video Productions.
This was a freestyle vocal track recorded live, with the music track added in later, most likely.
I have met and secured most of my clients (98% are bands) through Facebook actually, and then word of mouth after I release the content and people can see an example.
I would say it's probably whatever setting you rendered it out in. Make sure you select the proper one for the settings you filmed in.
Get used to it! I have filmed over 100 live performances and I get the nervous bubble guts before every gig, but once I start actually setting up it goes away.
Actually it's almost constant throughout. I just watched it again to make sure. Not sure, maybe it's on my end for that particular video, but I don't see why that would be.
Good video, but seems to suffer from horizontal line/glitch (not sure the exact term) pretty badly in some spots.