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I never noticed a rectangular shaped object until I read your post. . I guess it does kinda look like maybe there is something being held by the fingers, but it isn't clear enough to tell for sure.
I just really hope that the driver doesn't get summoned to court or questioned by police or anything. . Guy probably already has a busy enough life without being bothered with providing testimony.
OP, please don't make any kind of report or do anything that could cause this driver to have to turn over his phone or any footage on it. . Just let the guy be. . It's his footage, let him do whatever he wants with it, or do nothing at all with it ... that should be his choice, and his alone (yes, it should be his choice and his alone, even if the footage could save a life or bring someone to justice for a horrid crime, etc.).
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"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".