As always – it depends.
It depends on the video’s intended audience, their motivation, and their prior knowledge, and the “context” for their viewing. Most videos can address developing awareness and knowledge – but may not be the best for developing some skills – depending on their prior knowledge.
In instruction, I generally like them for conveying INFOs, and DEMOs, and maybe the instructions for APPOs (Application Exercises). They may be used as a Job Aid, or to augment/support a Job Aid in providing visual cues that require motion vs static pictures/diagrams to help get the message/instructions across – in regular or in slow-motion, start-and-stop motion speeds.
But watch out for inadvertently creating Cognitive Overload.
As I design most Instruction using a Facilitated Group Process of Master Performers and Other Subject Matter Experts, I let them discuss the merits or shortcomings of video as the medium for the Target Audiences that they represent, and the when/where of the consumption of the video(s) – and then let them decide – in the Design Process as the Design Team “systematically processes” the approved Analysis data.
Here’s what Donald Clark (Plan B) says about the research: http://donaldclarkplanb.blogspot.com/2019/11/video-for-learning-15-things-research.html
Here is what Richard Mayer says about his research: