There have been attempts to cryptographically sign images, which have largely been broken, but the principle is there: https://www.dpreview.com/opinion/9955873926/why-cryptographi...
See https://contentauthenticity.org/how-it-works
If the plan is to have a few trusted manufacturers for CCTV and police cameras than that might work, but will do little to combat misinformation.
If the plan is to have a few trusted manufacturers for CCTV and police cameras than that might work, but will do little to combat misinformation.