There are two ways to add video to a page.
Option 1:
Utilize Video Block component to insert
Note: Video Block component only accept Youtube or Vimeo video at this moment.
Option 2:
Utilize Gallery component to insert video to the right rail.
Note: Gallery component only accepts Vimeo mp4 at this moment.
Option 3:
Utilize Generic Content component to insert video's iframe embed code.
Note: We do not recommend this option due to the inconsistent result from the iframe and AEM Rich Text editor. From our past experiences, AEM Rich Text Editor will strip out elements within the iframe embed code and causing the iframe to fail. Please only consider using it only if you understand the risk.