Hi! I’m from Canada, and my friends and I made some software to make this really easy. It might be a good starting point. It works with a regular USB web camera or the Kinect for Xbox, and you can try it for free - it will run on any computer. You can find an effect really similar to the one you linked to here: http://www.po-motion.com/motion-maker/effect/scatter
Just upload your own background and some pictures of flowers.
We also have a contributor’s program so if you buy the software, you can make effects and donate them to the website to get them for free… they just have to be your own artwork and they can’t have logos or pictures of people.
If you need help, just use the contact form on the website. Hope this helps!