What is the Greek word of video?

There isn't a single perfect Greek word for "video" in the sense of a moving image recording. The concept is modern. You would need to use a descriptive phrase. Possible options depending on the nuance you want to convey include:

* κινηματογράφημα (kinimatografima): This literally translates to "cinematographic recording" and is probably the closest single word equivalent, though it implies film rather than digital video.

* κινούμενη εικόνα (kinoumeni eikona): This means "moving image," which is a more accurate description of the content of a video.

* ψηφιακό βίντεο (psifiako video): This is a phrase meaning "digital video," directly borrowing the English word "video" but using the Greek word for "digital." This is common and perfectly acceptable.

Therefore, depending on context, you'd choose the most suitable option. There's no single, ancient Greek word that covers the modern meaning of "video."