If you have already bought the laptop then try it.
If your happy with the perf then your good.
If your serious about editing then you want a desktop.
I doubt you can build one for $800.
I bought this laptop for 700 Euro
https://www.amazon.de/gp/product/B01M14NXD5/ref=od_aui_detailpages00?ie=UTF8&psc=1
is it good for video editing in a high level or should i buy components and build my own pc for the same price?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic