There is no way how you could actually convert MP4, or any of the video as ISO disk image. However, you can burn *.mp4 much like any other files as part of burning compilation. This can be done using any burning software.
Convert MPEG-4 video file format to CD/DVD/HD DVD/Blu-ray disc ISO binary image.
We found 2 software records in the database related to .mp4 to .iso file format conversion.
Microsoft Windows software - convert mp4 to iso on Windows
A popular burning and multimedia suite from Nero.
Convert from mp4 file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mp4 to iso. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert mp4 to iso on OS X
Roxio Toast 11 Titanium makes disc burning, DVD copying and video conversion as easy as drag, drop and go.