Actually, people get charged with assault for flashing a light in a cops eyes.
https://www.gillettenewsrecord.com/news/local/article_56716d86-29af-5023-8018-75577af52c92.html
They've also been charged with obstruction, interference, and other contempt of cop offenses.
Cops are not allowed to do this either, especially when it's to obscure video. It is called "prior restraint" and is an explicit violation of the first amendment.
Now, the trick is figuring out how to press charges when they aren't even being held accountable for blatant murder in the streets.