"Some source comfirm that the video is a real footage from Apollo 12 mission,and no one was able to find an explanation."

I haven't been able to open up that video to look at it, but I need to ask, when you say "No one was able to find an explanation", where did they ask? How about the NASA JSC audiovisual office, Mr. Mike Gentry? Or did they just ask some current PAO flack at some NASA center elsewhere?

Visual anomalies outside the windows were common on Apollo (they were called 'moon pigeons') and there was lots of interest in what they were telling about the status of the spacecraft, its insolation, propellant valves, pyro bolts, etc.

This is a report that NASA commissioned to examine such phenomena. I'll bet that the sources you seem to depend on didn't tell you about this study.


Moon Pigeons
http://members.aol.com/moonpigeons/

Other items:

Apollo-11 stories
http://www.debunker.com/texts/apollo11.html

NASA’s CL-862 video (1979)
http://www.beyondroswell.com/roswell/nasaufovideo.html