> If he had used bodycam footage, then you get into interesting copyright laws

Not that interesting. The US government cannot create copyrighted works. Works created by the government are public domain. This is why Ghidra (made by the NSA), for example, has a really odd license, where the parts written by the government are "not subject to U.S. copyright protections under 17 U.S.C.", whereas future contributions by the public are covered under the Apache license.