Canvas lets you embed video content within a page.
Pages is designed to open to the front page for a group, if there is a front page selected. Click the View All Pages button to select a page from the Pages Index.
Copy the Embed Code
Locate the code from the external video source you wish to use. To do this, find the Share option  on the frame of the video and look for the Embed option . For the best user experience, embedded videos should be no larger than 560 pixels wide .
Paste the Embed Code
Copy the displayed embed code for the video content and paste it into the HTML editor in Canvas.
View the video embedded into your page.