Need a Stock video supplier

I wanna start a YouTube channel for short videos, for that I need a sample video supplier. There are few samples from few channels, before applying this check for this sample videos.

https://youtube.com/shorts/9U3Ys7PobG4?feature=share

https://youtube.com/shorts/2LgcVeu3q_E?feature=share

https://youtube.com/shorts/_Qgn14YmEkY?feature=share

https://youtube.com/shorts/asOKEtr7gUM?feature=share