I found the issue. Youtube widget is not working because of Youtube API changes.
I made few changes in theme files but can’t replace them on your site so follow my steps below:
1. Navigate to / plugins / elvyre-core / includes / content-manager / social_photo_stream.
2. Replace all files with files in attachment (social_photo_stream.zip).
3. Replace socialstram.jquery.js in / plugins / elvyre-core / js / with file in attachment (socialstream.jquery.zip).
API key field will appear when you add Social Photo Stream widget where you will need to enter Youtube API key and channel where your videos are.