Help: valid owp, need trv to re-enter, which forms?

[Smela]

Hi,

Can anyone please guide me.
I hold an open work permit but have to apply visa.
So here is my situation:
My open work permit application was in process inside Canada when I had to travel ourside of Canada. Now I am in Pakistan and have valid open work permit but i need visa to enter Canada
Can someone please help me that which application do I have to fill and what documents do I need to submit?
Do i need to apply temporary resident visa?