If you have an .mp4 or .flv file that uses the H.264 video codec, you can attach the video to any confluence page and allow it to be played embedded inside the page, with the help of jwplayer. I've created two custom Confluence macros for this purpose:
Example
This wiki markup embeds an mp4 video:
{mp4:num=1|width=352|height=240|url=/download/attachments/22546192/example-video.mp4}
Here's what it looks like when viewed on a page:
Flash required for inline viewing.
If you have an flv video, just use flv as the name of the macro instead.
