Add `cameras.py` to pass pipeline, which is a copy of `cameras.py.template`.

backend/cameras.py

+restaurants = [
+    {
+        "restaurant": "local",
+        # the linear function estimating the waiting time t based on the number of people n and the number c of open checkouts is:
+        # t = a * n / c + b
+        "a_factor": 30, # slope
+        "b_factor": 120, # y-intercept
+        # list of all the cameras that correspond to a same restaurant
+        "cameras":
+            [
+                {   
+                    # the RTSP url will be: rtsp://user:password@IP:stream
+                    "IP": "",
+                    "user": "",
+                    "password": "",
+                    "stream":  "stream1",
+                    # list of the coordinates of the points which constitue the region that should be masked on the picture
+                    "mask_points": 
+                        [
+                            # polygon which should be part of the mask
+                            [
+                                # [x, y] coordinates of each vertex of the polygon (on a 1280*720 picture)
+                                [70, 370],
+                                [420, 720],
+                                [1280, 720],
+                                [1280, 250],
+                                [930, 215],
+                                [450, 550],
+                                [130, 350]
+                            ]
+                        ],
+                    # list of the coordinates of each checkout
+                    "checkouts":
+                        [
+                            # each checkout corresponds to a rectangle, indicated by two x and two y coordinates
+                            {
+                                "x1": 380,
+                                "x2": 435,
+                                "y1": 740,
+                                "y2": 780
+                            },
+                            {
+                                "x1": 300,
+                                "x2": 350,
+                                "y1": 830,
+                                "y2": 880
+                            }
+                        ]
+                }
+            ]
+    }
+]