I found a code to upload a Video to YouTube with Google apps script. But with this i can only upload a file from a URL, not from google drive. Now, how can i upload a file from Google Drive using Google Apps Script?

That's the Code i found to upload a Video from a URL to YouTube:

function upload(url, title, description, topics) {
    try {
        var video = UrlFetchApp.fetch(url);
        YouTube.Videos.insert({
            snippet: {
                title: title,
                description: description,
                tags: topics
            },
            status: {
                privacyStatus: "public",
            },
        }, "snippet,status", video);
        return ContentService.createTextOutput("done")
    } catch (err) {
        return ContentService.createTextOutput(err.message)
    }
}