Video not showing on smaller resolutions

This is more of a CSS related issue than a WordPress one, but it looks like you have a media query which hides the mk-section-video class when the window width is between 1024px and 320px.

Here is the CSS you’ll need to remove inside your Jupiter theme stylesheet in order to keep the video displayed

@media only screen and (max-width: 1024px) and (min-device-width: 320px)
.mk-section-video {
    display: none!important;
}

In the Jupiter theme you can add CSS here….. Jupiter > Theme Options > Advanced > Custom CSS