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You upload you vid to a hosting site like youtube then use the link to post it in your thread.

how wher i post link

Just copy and paste the link directly in your post when you're doing the "submit your post" part.

I seem people embed vides loaded youtube.
I just came watching one here:
https://steemit.com/video/@redpalestino/timelapse-video-cross-my-place
it's not mine but basically, I think you find the youtube share option to get the embed code and stick into your post in HTML.
If you are looking for help with including image, then I have a post that share how to do that.

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