change link with iframe when export

[driftcrow]

maybe these is better for export.

(defvar org-yt-iframe-format
  ;; You may want to change your width and height.
  (concat "<iframe width=\"640\""
          " height=\"480\""
          " src=\"https://www.youtube.com/embed/%s\""
          " frameborder=\"0\""
          " allowfullscreen>%s</iframe>"))


(defun org-yt-export (video-id description backend ext-plist)
  "Export youtube video with VIDEO-ID to BACKEND.
If DESCRIPTION is a string put it below the video.
EXT-PLIST is the data channel for the export backend."
  
  (cl-case backend
    (html (format org-yt-iframe-format
                  video-id (or description "")))
    (latex (format "\href{%s}{%s}"
                   video-id (or description "video"))))
  )