is it possible to create an interactive video in mp4

This may be helpful:

Helpful Tip: Interactive Video in Adobe Captivate 8 | eLearning Brothers

Is it possible ?

A 'video' like mp4 is always passive. You can pause that video, you can restart playing but there is no real interactivity. Lot of misunderstanding. Have a look at this article, which I wrote, you'll see that the video itself is not interactive, the buttons are but you have to publish to HTML5 (or SWF), not to mp4.

Interactive Video Buttons - Captivate blog