Hi Haki Saki,
I am really sorry for the delay of this reply.
Regarding on the video issue, it seems like everything is working correctly from end. Check my video link here,
http://screencast.com/t/UfdPrHml . Am I missing something?
When I try to share a post from my website with Twitter Share I get the attached image
This is because you have enabled lockdown mode and twitter are not able to access the stream url directly, hence causing it to display like in your screenshot above. Refer my screenshot here,
http://screencast.com/t/FqZLuZyt .