In that exact situation, videos are usually use an Image Authentication System. A method of digitally signing them to prevent forgery. But basically, no. There

In that exact situation, videos are usually use an Image Authentication System. A method of digitally signing them to prevent forgery. But basically, no. There is a burden of proof on the prosecution to show the evidence has not been tampered with after taken from an official source, but recreating the same thing wouldn't change anything - unless you were able to prove the IAS was flawed and could be duplicated (Nikon had this problem a year or two ago).