There are many reasons why someone may feel they have seen a ghost; too much coffee, mental episode, ingesting a mind altering substance, lack of sleep etc.
Almost all of those reasons create a relaxation of your brains mental blocks, the same mental blocks that keep "events" it does not recognize from entering your thought process or visual cortex.
Personally I would not trust a video or audio recording of anything related to this subject (most subjects actually).
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