Use a rolling average of iou to determine if an object is no longer stationary (#9381)

* Use a rolling average of iou to determine if an object is no longer stationary

* Use different box variation to designate when an object is stationary on debug

* In progress

* Use average of boxes instead of average of iou

* Update frigate/track/norfair_tracker.py

Co-authored-by: Blake Blackshear <blake@frigate.video>

---------

Co-authored-by: Blake Blackshear <blake@frigate.video>

frigate/util/object.py

@@ -323,6 +323,22 @@ def reduce_boxes(boxes, iou_threshold=0.0):
     return [tuple(c) for c in clusters]
 
 
+def average_boxes(boxes: list[list[int, int, int, int]]) -> list[int, int, int, int]:
+    """Return a box that is the average of a list of boxes."""
+    x_mins = []
+    y_mins = []
+    x_max = []
+    y_max = []
+
+    for box in boxes:
+        x_mins.append(box[0])
+        y_mins.append(box[1])
+        x_max.append(box[2])
+        y_max.append(box[3])
+
+    return [np.mean(x_mins), np.mean(y_mins), np.mean(x_max), np.mean(y_max)]
+
+
 def intersects_any(box_a, boxes):
     for box in boxes:
         if box_overlaps(box_a, box):