This is a hack based fork of swcursor to replicate mouse overlays on linux.
This is a simple software cursor for X11 environments, it creates an overlay window with an (large) image that follows the cursor around. You will need to arrange for your normal cursor to be hidden, or screen record using ffmpeg's kmsgrab which often does not capture harware cursors at all.
You will need to have working development libraries for gtk-3.0, gdk and xlib.
$ make
$ ./swcursor
For details see https://github.com/andykitchen/swcursor