Camtasia supports export to the MPEG-4 (MP4) format by default, so you can use the existing share and publish function to export projects as MP4 movie. A .cam file probably originates from some very old version of Camtasia, so the latest versions of the program may not support it. You would have to use some older version.
Convert Camtasia Studio project file to MPEG-4 video file format.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert cam to mp4 on Windows
Camtasia Studio is screen video capture and video editing application for Microsoft Windows. User can define area of the screen, or window as well as full screen that will be recorded to video footage.
Convert from cam file
to mp4 file
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.