SC 1.2.3 Audio Descriptions Media Alt
1.2.3 Audio Description or Media Alternative is basically the flip of the coin to captions.
So this is for things that are visual on the screen.
You need the audio description, but there is an exception when the video is basically
an alternative for existing text already and when it's labeled as such.
So for example, you have an instruction that is written and then you have a video that describes the same thing.
Then you don't need to have an audio description for that.