Is it possible to can hummus?
No, it is not safe to can hummus, even with a pressure canner. The problem is that it has a paste consistency, and the temperature has trouble penetrating through the middle of the jar. No safe home canning process has been established which can consistently reach the required temperatures. 

You can buy canned hummus, but that's no contradiction. Home pressure canners operate at nominal 10 PSI, while industry has access to different equipment. 

Some people go around the problem by canning everything that goes into the hummus whole - so a jar of chickpeas, seaseme seeds (not the ready tahini!), spices and lemon juice in liquid. They stick a blender into the can after they open it, to make their hummus. That's a safe practice, since you can can chickpeas on their own.