mp4 video - zoom function?

I have added a mp4 video at a SP Page.
The problem is that the presentation of the video is to small (a small band). Certainly on a phone.

I have find this code at this forum and this allows me to have more control over the height and width, but the presentation of the video itself is not good.

Any suggestion?

Thanks in advance

.sppb-addon-video-local-source{
height: 450px;
}
@media only screen and (max-width: 480px){
.sppb-addon-video-local-source {
position: inherit !important;
height: 700px!important;
}
.sppb-addon-video .sppb-addon-video-local-video-wrap{
padding-top: 0!important;
}
}