In order to add a video complete with its embedded player (so users can play the video directly in the web page, rather than just following a link) you need to add some html code to the page. You need to be in HTML code mode to do this: from Edit mode click the Edit tab, then click the "Show/Hide HTML code" button on the editor toolbar (if you have it). Type or paste the code into the page at the appropriate point (sometimes it's helpful to type the word "VIDEO" into the page in  ordinary edit mode first, then search for VIDEO in the html code, so you know where your player needs to be inserted).  The code looks like this:

<EMBED name=RAOCXplayer pluginspage=http://www.microsoft.com/Windows/Downloads/Contents/Products/MediaPlayer/ src=http://on10.net/videos/MicrosoftSurfacing_on10.asx width=320 height=280 type=application/x-mplayer2 allowscriptaccess="never" showstatusbar="0" loop="false" autostart="0" displaysize="0"></EMBED>

Replace the src=http:// bit with the location of your video content. If it's on an external web site then use an external address, such as the one in the example above. If you have loaded the video onto the Core Site server then use an internal address, like that shown below:

<EMBED name=RAOCXplayer pluginspage=http://www.microsoft.com/Windows/Downloads/Contents/Products/MediaPlayer/ src="/upload/Carelink/Rich media/cowbell27.wmv" width=320 height=280 type=application/x-mplayer2 allowscriptaccess="never" showstatusbar="0" loop="false" autostart="0" displaysize="0"></EMBED>

Finally you can alter the settings for the player:

Width, height: set the player size in pixels

showstatusbar="0" : The video player status bar is hidden, setting the value to "1" shows the status bar

loop="true": the video rewinds and plays again once it has been started; changin it to "false" lets it play just once.

autostart="0" : The player must be started by the user, setting it to "1" makes the video start automatically