This is intentional. Often a video will need to be embedded with a block of text following immediately which could look wrong if there was a gap separating the video and the text.
If you need a gap, the quick & dirty workaround could be to add a couple of line breaks after the video, however a CSS tweak would be better. In this case I think adding a margin value would probably be more appropriate than padding.
To do this add:
.embed-wrap {
margin-bottom: 20px;
}
To your child theme or custom styles plugin.