Preheat oven to 400 degrees. Brush baking sheet with olive oil. Separate cloves of garlic, leaving skins on, and spread on corner of baking sheet. Cut zucchini in half lengthwise; cut each half into three flat strips. Spread on baking sheet in single layer. Cut pepper in half, remove seeds, and cut each half into three strips; place on baking sheet. Bake 5 to 10 minutes or until vegetables are soft and lightly browned.
Squeeze the roasted garlic cloves out of their skins directly into the bowl of a food processor. Add chickpeas and puree, adding pickle juice slowly until mixture becomes a smooth paste. Add pickles to bowl and pulse machine enough to coarsely chop pickles and blend. Add salt and pepper to taste.
Cut pitas in half and place a pinch of alfalfa sprouts in bottom of each. Add a zucchini slice, a pepper strip, and divide hummus evenly among pitas (about 1/4 cup each). Top with more sprouts and serve.