For people in a video you need a model release from them. This is also a mistake many people make, they use Creative Commons licenses and think they are safe. A picture or a video needs model releases for the people in the picture (several exemptions apply).
If that is true then basically all the photographs in Wikipedia are illegal since the only check they do is for copyright not for model release. Pretty sure that's not a legal requirement.
Of which photos are you thinking? It most certainly varies from country to country but public figures or random people captured when taking a picture of a landscape or a building are at least in some countries not subject to such rules.
