Preheat oven to 350 degrees. Process cookies and nuts in a food processor until finely ground. Add melted butter, sugar, salt and vanilla and pulse to moisten cookie mixture. Press the mixture across the bottom and up the sides of a 9 inch pie plate, packing it tightly with your fingertips. Bake until crisp, 6 to 8 minutes. Cool completely before filling.
Place the nuts in a food processor and chop finely. Set aside. With an electric mixer, whip the cream and vanilla until stiff peaks form. In a separate bowl, combine 1/4 of the whipped cream with the Nutella. Stir until smooth. Gently fold Nutella mixture back into the remaining whipped cream. Fold in the reserved hazelnuts. Scrape into prepared pie shell and smooth the top with spatula. Cover with plastic wrap and refrigerate until firm, about 6 hours.