The video 1) 2) represents a video or movie.
<video width="320" height="240" controls="controls">
<source src="/_media/video/flipbook_within_a_flipbook_flipception.mp4" type="video/mp4">
</video>
<video
src="tgif.vid"
poster="/poster.jpg"
autoplay controls>
</video>
To overcome that the images overflow their container, you can use this rule
img, embed, object, video {
max-width: 100%;
}