This conversion is in most cases related to various text-to-speech conversions, .i.e. transforming a text file or document (in this case MS Word document) to a multimedia file (for example MP4). You can find lots of programs for this, but you may find more options in the more common doc to mp3 conversion that deals with this subjects.
Convert Microsoft Word document (prior version 2007) to MPEG-4 video file format.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software - convert doc to mp4 on OS X
A text-to-speech software for Mac
Convert from doc file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.