stock video footage

I think you guys might be interested on this, it's called Movio.... (you may have seen sth similar? Cuz I've seen Synthesia recommended in another post, and I've tried Synthesia.) Basic info: it's a web app (drag and drop style) to create AI spokesperson video. so how we define this tool, AI...

Can anyone help me find a good stock video footage website. something with a wide variety and good quality. Both SD and HD formats. Is there already a section for stock video footage? Thanks B