Absolutely it is.
Just drop the "Add Task" action onto a process as an automatic action. As an automatic action you then need to populate it's values either using static data or grab from elsewhere on the process using value types or calculations.
The trick I guess is to only create (on Save I'm guessing) when priority is 1. You'll need to have the "Start Status" (black bullet) status at the head of your process and a (diamond) condition that tests if the Priority attribute the value required and then branch (true) to your new automatic action, else bypass it (false) and carry on to the OPEN status.
I'm simplifying down but that is the gist. You can set which TASK process to fire as a property of the automatic action.