How can i add video in rich content of a cms?

so basically I want to add a video to my website but there is no option for adding videos in the rich content section

If you are using vimeo or youtube, you can just paste URL inside of rich text, and it will automatically create video. Currently our rich text doesn’t support local videos to be uploaded.

i did that but the size of the video was very small. is it possible to adjust the size of the video and adjust the padding, etc?

Can you give me a website where that happens?
Video size should be 16:9 by default