Here is an detailed tutorial on how to replace a zipper.
Zipper - iFixit
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
How to replace a zipper with a sewing machine – Baukjen
Schöffel Easy Jacket Zipper Replacement - iFixit Repair Guide
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
Schöffel Easy Jacket Zipper Replacement - iFixit Repair Guide
105 Pieces Zipper Repair Kit #3#5#8, Zipper Replacement with Install Plier for Repairing Coats, Jackets, Tents, Backpacks, Sleeping Bag, Luggage
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
Learn to replace a jacket zipper
Quick-Fix: Replacing a Zipper Pull - iFixit Repair Guide