This is the 2109th most frequent Korean word.
영상에
"영상에" means "in the video" or "on the video."
In this sentence, '영상에' is used to indicate the setting or medium within which the beautiful natural scenery exists or is presented.
이 영상에는 아름다운 자연 경관이 담겨 있습니다.
This video shows beautiful natural scenery.
Here, '영상에 대해' specifies that the discussion or sharing of opinions is focused on or concerning the video.
사람들이 이 영상에 대해 다양한 의견을 나누고 있습니다.
People are sharing various opinions about this video.
In this context, '영상에' denotes the school event video as the entity or medium where the individual's appearance was expected but did not appear.