Create a rectangle, select it and in Web Properties select placeholder-body. Insert the following:

<iframe name=videoiFrame src=jan_2011.mp4 width=640 height=540 scrolling=no frameborder=0 marginheight=0 marginwidth=0></iframe>
Change the src to match your mp4's name. Provided the mp4 is in the same folder as your webpage it will load. Use filezilla or similar to uplaod your mp4.