Sous Vide Beef Tenderloin Roast

Name: Sous Vide Beef Tenderloin Roast
Ingredients: 4.5 pounds whole beef tenderloin; 1 tablespoon sea salt/kosher salt (such as Redmonds®); 1 teaspoon freshly ground black pepper, or more to taste; 6 cloves garlic; 3 fresh thyme sprigs, or to taste; rosemary sprig; 3 tablespoons unsalted butter, divided, or more as needed; 2 tablespoons olive oil, or as needed; 1 splash red wine; 1 tablespoon gelatin powder; 1 cup cold water; salt and freshly ground black pepper to taste