Because of a missing option to set the type for MediaComponents - Video / Audio can't be played on iOS devices.
If you want to enable it with the Wicket 7.2.0 you have to override the onComponentTag method:
See Table 10-1 File name extensions for MIME types:
I used remote debugging of iOS Safari / Mac OS X to check if all videos are playing, now.
http://moduscreate.com/enable-remote-web-inspector-in-ios-6/ (for iOS 9 very similar)