There do exist certain tools that allow users to take PowerPoint presentations and slide shows (*.ppsx) and create a multimedia video from it. Programs like ImTOO Convert PowerPoint to MP4 are pretty capable in this type of conversion.
Convert Microsoft PowerPoint 2007/2010 Open XML complete slide show to MPEG-4 video file format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert ppsx to mp4 on Windows
A PowerPoint to video converter
Convert from ppsx 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.