We deal with thousands of bug reports and about half of them are useless because the reporter did not follow the bug report guidelines. So we are very strict about this.
Your .capx includes no video files and sets an empty video src. I don't know why you expect that to work? It also contradicts your original report, which mentions setting a video src of "videoname.webm", but your .capx does not do that, so I am not sure what you are really trying to report. It doesn't look like there's anything particularly wrong here, so closing as won't fix.