You are able to upload videos to your site and stream them.

To upload a video from your computer go to the "add file" at the bottom of the folder in which you wish to keep it, browse to find it, and click "add file". Once you have it uploaded into the folder, click on its link in the folder to view it. With such media there should be an option to view the embed code. Take this code and copy it into the HTML for the page you want to view the video on.

If the video is already on the Internet (ie. YouTube or Google videos), click on the Embed media button at the top of the editor in the page editor and copy the video's URL into the appropriate box.

You can also click on the embed media button on the editor toolbar and paste the embed code or the URL of the video into the appropriate box.