Lifehack: place your video in a shape with VSDC Free Video Editor
У вашего броузера проблема в совместимости с HTML5
Here's one more tutorial on working with shapes that might come in handy if you're making a nice greeeting card or would like to be more creative in your videos or presentations.
Method 1 is more simple as it envisages ready-made shapes available as presets.
Method 2 is a bit more complicated but you can create any shape of your own with a free shape tool.
All the tools are available for FREE.
Enjoy your montage!
Download VSDC Free Video Editor right now - http://www.videosoftdev.com/free-video-editor