using a scene from a movie or clip that is posted on youtube (Fair Use?)

I would like to know opinions on this>>> taking a scene from a movie or clip that is posted on youtube. selecting parts, possibly using efx like zoom and slo mo. Adding Voice over, titles, text and explaining your take or opinion, in a totally different way then used in the original clip 1) Would there be any way to tell where you download the clip from (if there is no icon or watermark)
2) Would doing this fall under fair use?
3) Where do those who have channels that use the "fair use" clause to be able to post videos using copywritten content get their video clips from? DVD's? Streaming movies? Using other youtube clips like I am inquiring about?
Inquiring minds want to know?
 
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