Hi
This fatal error is a different problem not connected with video issue. For that I would advice to remove Social GK5 and use a Custom HTML module with a code generated on Twitter site directly. There were a change of Twitter API which may not be included in module yet.
https://apps.twitter.com/Now for a video script. Problem is not connected with files or wrong codding, but a security measure used on server which does not allow to load iframes by other scripts and video is played in an iframe. I do not suspect Your hosting provider would remove the security for that, since I would not do that myself, but unfortunately this means that You cannot use the script provided by template. You will have to use a different script for that.
Look for a script which does not create iframe, but simply provide them on page load and hide/show them on click. That's the only way iframes are allowed when cross-origin framing is enabled.