I'm not aware of any for vdub . But shotcut (free, open source) has the bigsh0t plugin, which can manipulate several types of projections, FOV adjustment . Since it's a NLE, adjustments are keyframeable (changes over time) and you can "see" what you're doing with feedback . (There are more complicated open source programs like natron that can do this too)
Make sure you download the 2.1 release
https://monochrome.sutic.nu/2018/09/17/bigsh0t.html
https://bitbucket.org/leo_sutic/bigsh0t/src/master/
"The artist formerly known as DH"
also wrote the avisynth plugin defish with FOV adjustments
https://forum.doom9.org/showthread.php?t=152860