How to move mouse with 2 fingers on trackpad?
There are a couple of apps that I know of that does this kind of thing: 


BetterTouchTool
MagicPrefs


Screenshots from BTT (left) and MP (right) 




Disclaimer:  These are not tools I use personally (no need) so I cannot vouch for them. However, BTT has a trial and MP is free.  So, your risk is minimal if you want to test either of these out.