You can add a video in TW4 by
- adding a hotspot on a scene.
- linking an action (miscellanous > open pop up window)
- selecting a .swf file (the video)
but there is still an issue with the sound : if you close the window while the video is being played, the sound keeps on going.
It's the case with the online easypano example : http://easypano.com/virtual-tour-gallery.html# > NanHui Exhibition > movie centre thumbnail
I hope this can be fixed in the next release of TW