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Seeing is truly believing. If it can be agreed that the footage from many different source videos or cameras has not been altered digitally or otherwise, then visual evidence is physical evidence.
Using visible light (a small portion of the Electro-Magnetic Spectrum) as well as many other frequencies (radio, IR, UV, X-ray, gamma) through remote sensing is how we study and know much about many phenomenon through-out our universe including scientific investigations here on Earth.
Every-time you use a still camera or video camera with visible light, you are capturing physical evidence, you are capturing a moment in time. As Einstein states --- at the speed of light time stands still. So when those photons of EM wave "light" energy intersect with the film plane or digital plane of a still or video camera, you are indeed capturing a moment in time and that is physical evidence. As long as you know about the camera,lense, and medium for recording, much can be determined and measured from the actual film or digital photos or footage. Comparisons from one known object in an image to another known object in an image can reveal so much, then compare this to an unknown object in an image, and relative size, speed, approximate mass, and even energies involved can be determined.
Why do you think we spend so much money investing in satellite surveillance and our government has some of the best in the world, for use by our military, CIA, and many other applications etc?
Land-based images are just as important and valid. When we take images by camera or by video we are all "remote-sensing" and a great deal can be analyzed, studied, and revealed from this physical evidence. These videos of actual footage are all very, very important. You can not dismiss visual evidence. It is physical evidence.
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