Sure, why not? The improvement in tools to efficiently produce and disseminate video are enjoyed by honest journalists too. Many of these official events have more than one photographer/videographer [0]. If only 1 outlet can produce a highly-suspicious video of a public event recorded/observed by dozens of other outlets, then distrust that single outlet. We already have had to do this in a medium that is efficiently easy to fabricate: text.
Society as a whole will just have to realize that video is as alterable as text.
[0] https://www.nytimes.com/2017/06/09/insider/a-photo-of-james-...