I use pectic enzyme in all my fresh fruit and juice wines and ciders. It goes in primary, about 12 hours before you pitch the yeast, and about 12 hours after campden.
If you've got a pectin haze now, you can add it to see if it clears. You could dissolve 1/2 tsp per gallon in a little of the cider and then pour it in and gently stir. If you don't have a pectin haze, there is no need for the enzyme.