I’m about to purchase Blue Iris does anyone have experience, or perhaps can another software do what I'm looking for?...I’ll have a camera pointed at our mailbox. I want it to record on motion sense. The problem is our home is on a somewhat busy street. Would it be possible to signify the difference between a car or someone walking by and someone actually using the mailbox. I’m guessing by starting the recording if the object stays in frame for a extended period of time.