video vs telecasting

video and telecasting both are nouns.

Word	Noun	Adjective	Verb	Adverb
video	Yes	No	No	No
telecasting	Yes	No	No	No

As nouns, video and telecasting are synonyms defined as:

video and telecasting: broadcasting visual images of stationary or moving objects

Other synonyms of video include television, TV.

video (noun)	telecasting (noun)
a recording of both the visual and audible components (especially one containing a recording of a movie or television program)	broadcasting visual images of stationary or moving objects
the visible part of a television transmission
broadcasting visual images of stationary or moving objects
(computer science) the appearance of text and graphics on a video display