I currently can't find any online reference to any CCTV expert studying the captured image. So, I contacted one myself. I spoke with a recognized CCTV expert who works in the Las Vegas casino industry where surveillance is a vital element of business. In his opinion, the evidence I currently possess does not rule out either a natural or a paranormal explanation. It seems that the security cameras at Belgrave trigger at the appearance of infrared emissions within a certain programmed range. When properly tuned, a camera should not trip for nonhuman infrared ranges emitted by moving animals and plants.
The primary source of infrared radiation is heat or thermal radiation. Any object which has a temperature above absolute zero (-459.67 degrees Fahrenheit or -273.15 degrees Celsius or 0 degrees Kelvin), radiates in the infrared. The warmer the object, the more infrared radiation it emits. In theory, then, a leaf blowing across the lens should not cause the camera to trip. If the infrared sensor was malfunctioning, he notes, it's likely that the camera tripped more often than this one occurrance, creating an evidence trail of malfunction--which may have gone unreported in this case. Because only one of three cameras tripped there are strong odds of malfunction, however, he explains, it is possible for an object to be situated at just the perfect point to be recognized and responded to by only one camera.
According to this expert, the glowing shape that appears in the CCTV image should not appear in the case of a simple camera malfunction or atmospheric disturbances that he is familiar with. As reported by the press, according to local meteorologists, there was no rain or lightning that evening, making a lightning strike a remote possibility. The shape is segmented into three parts that some feel suggests a moth. However, he responds, a real moth fluttering by the lens would provide very different type of image. And moth that has crashed against the lens should leave a cloud of wing scales that mar the following images.
Update: Since I created this page, I have been contacted several times by members of ghost hunting groups who claim to have conclusively solved this mystery; it's a leaf blowing across the camera. I have asked these groups to provide details of their investigations that support their conclusion, but I have, to date, received nothing.