I'll give it a try even if it isn't a video.
Making a video is not that hard. Go to your photo app and then click on video editor.
You could add a picture or images from the web, your choice, adding it to your story line each time.
Then you have an option to add sound (music)... a particular one you have saved or those offered on the page. When you are finished, click publish. Save to your videos.
Afterward You can go to youtube and sign in and upload it -- with options to share/or make private. I am not sure as to what you are really trying to do.