Slap can check me on this but that video stuff often sounds a lot better than it is. Most of it by necessity shoots from the top down and you can hinder it with a hat. Ground level stuff will be cluttered with intervening bodies. They undoubtedly will get some good evidence from all the photos and videos but it ain't magic.
An accident at the Reno Air races involving a P-51 was an example though of video proving to be of vital importance in finding a cause. If you look at the NTSB report it is filled with extremely detailed images, some of parts actually failing in flight. The report is fascinating. The aircraft was N79111 if you want to find it on the net.
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