I couldn't detect anything. I have no reason to believe that anything other than a 757 hit the Pentagon that day. Video Surveilance cameras, depending on the system, will usually only capture 30 or less frames per second. Now, Im no physics PhD but, that camera captured probaly 150 yards, or less, of green field in front of the Pentagon with a 100 ft aircraft moving at 100 mph, how much would you be able to see on the captured video at 30frames per second. There are two frames that show anything at all. The firsts is a white streak/blurr possibly a cylindrical object on the far right of the screen and the second is the start of the explosion. My bet is the film is actually a pigeon flying by the camera position and the fireball is actually super imposed on the film.
It most certainly was not the 757 that witnesses say hit the Pentagon and cannnot be the "missing" 757 with 100 souls and crew aboard.