No, absolutely not. This will only serve to prop up a false confidence in correctly signed videos. So in the end you're giving all the power to black hat groups

No, absolutely not. This will only serve to prop up a false confidence in correctly signed videos. So in the end you're giving all the power to black hat groups and three letter services that can procure the secret keys from the camera vendors. Face it: Video proof is as good as dead, to delude yourself into thinking anything else is extremely dangerous.