I would imagine that the DA will use the video in court, as the photos don's make the case and there are no witnesses.
Generally, an offense like running a stop light is what is called a strict liability offense, meaning that either you ran the light red or you did not, and that excuses like "I could not stop because it turned red at the ast minute" very often do not work as defenses. Regardless however, this is the only potential offense that your husband has so he might as well either try to use it or try to plead down with the prosecutor to a lesser offense that perhaps will not put points on his license.
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The witness would probably only be able to confirm your husband's account, which as I mentioned may not prove to be a sufficient defense but is also the only one available.