Most of the OpenGraph tags are rendered automatically when EXT:seo is installed. If you want to add other fields as og:title, og:description and og:image, you can use some TypoScript code like this:

page {
  meta {
    og:site_name = YOUR_SITE_NAME
    og:site_name.attribute = property

    og:locale = en_US
    og:locale.attribute = property
    og:locale:alternate {
      attribute = property
      value {
         1 = de_DE
      }
    }
  }
}