A picture tells a thousand words. Just imagine how much information can be sent in a running video. In old money,the number of frames per second was standardised at 24, ie 24 pictures per second. In digital 
terms this can be 50 or 60 (aka Hertz Hz). Imagine now that you could have 60 pictures per second or 60 times 1000 or 60,000 words per second!!! That’s absolutely mind blowing and really opens up so much more in terms
of information dissemination.

In other words its like saying a photo in an article is a snapshot in time, whereas a video is having lots of pictures in sequence and all together one after the other, with no time lag and it can be as long as you wish and therefore much more information can be portrayed. There is also the added advantage of having sound. This can be voice and/or music so can be very powerful and useful for getting information across and setting the scene.