By default the player has minimal size, eg 100x100 pixels, and editors don't know how to fix it

[viktor-yunenko]

For example:

It can be fixed by adding custom attributes width & height, but it isn't something an editor not familiar with HTML can do.

There's a css fix:

.djangocms-video-plugin {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 30px;
    height: 0;
    overflow: hidden;
    
    iframe, object, embed {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}

[FinalAngel]

For now rejected as per #57