Welcome to Steemit @kevinlmoreno I hope this Quick Start Guide will help you: https://www.steemithelp.net/
I believe it's ok to use other people's videos and images if you give the source and creator due credit which you have. It, also helps if you include your own original work and voice (text.) when you using other people's works. Copy and paste is not a High Quality content and ruins reputation. Thank you for this video.