Test Case 1:
Input: Youtube video with cc in English Language. (link)
Output:

Test Case 2:
Input: video without cc in English Language (link)
Output:

Test Case 3:
Input: Youtube video in different Language( link)
Output:

Test Case 4:
Input: Video in .mp4 format (I Was Almost A School Shooter _ Aaron Stark _ TEDxBoulder_144p.mp4)
Output: