Our photo experts say that this is a cluster of balloons with a trash bag attached, but the man who actually took the video has this to report:

To some observers it might be easy to dismiss this object as balloons but after years of observing, basic patterns emerge in the nature of their movement, their forms and color. There’s a variety within this particular group of flying objects that many others are capturing around the world. I’ve videotaped them mimicking birds, plastic bags and airplanes, even Mickey Mouse. I know that sounds far fetched but it is consistent with this type of mimicry. This is an important piece of the puzzle that’s often missing in the UFO discussion.  I host and produce a weekly radio show In Other News and recently interviewed a woman in Toronto who says she and her kids are being followed by "fake planes."

Story Source:
https://www.youtube.com/watch?v=UTod6gksdTc