So using the html5 video tag (html5_video) one can incorporate video-clips. The problem is only to supply different formats to different browsers.
Basically there are three formats to choose from: "ogv", "webm" and "m4v".
"ogv" (Theora) is licence free and works with for example Firefox, and Chrome.
"webm" is also licence free and and newer than ogv, and it works with Firefox, and Chrome, although from the videos I've converted doesn't seem to work. Webm is needed for android.
"m4v" is proprietary, but it is needed for viewers with iphone.