The x-callback-url works great in iBooks. I created a document in Word 2013 and created hyperlinks using the x-callback-url scheme with the scriptures. I saved the document as a Web Page (htm, html). I opened the html in Calibre and converted it to an EPUB. I then transferred the EPUB to my iPad and opened it in iBooks. When I click on the links/scriptures, it opens Equipd Bible and opens the scripture and there is a button at the bottom to take me back to iBooks or you can use the 2 finger tap to go back to iBooks.
Here is the scheme for iBooks: equipdbible://x-callback-url/lookup?x-source=iBooks&x-success=ibooks://&scripture= You add the scripture after the = sign. There are no spaces after the equal sign or in the scripture itself. You can set the URL up as a shortcut on your keyboard on your iPad. That way all you have to type is the scripture.
How would I do a link like you are showing for the videos? I want to link to the lIntroduction to” videos at the start of each book in my Bible reading schedule. This is the online address - how do I type the call back link? https://download-a.akamaihd.net/files/media_video/4b/nwtsv_E_180_r480P.mp4