Gelatin will remove proteins that cause chill haze. It does not kill yeast. Some say use of gelatin can strip some of the hop aroma from your beer. This issue is debatable but something to keep in mind.
Cold crash the beer (I prefer to do this in a secondary vessel such as a 5gal. carboy). When the beer is at ~40F mix up the gelatin and stir it in. Let it set 2-3 days. Most of the haze-causing proteins will have settled to the bottom of the vessel. Package as normal. You'll have plenty of yeast still present in the beer to allow carbonation and, if you racked the beer carefully, will have less sediment in your bottles and clearer beer.