Add UI for video presentation service

[azduda]

• Added the ability to display the shared video with other participants,
• Sharing is possible from the conference controls bar (share button),
• The presenter can pause, play, seek video, get informations about current presentation and stop presentation from the level of buttons located under the shared video,
• Other participants can only see the video hosted by the presenter

[graduad]

We need to get an OSS approval for any new package that we use. Can we implement this functionality without these?

[azduda]

Chewie package is not that neccesary, we can do this without it. But video_player is needed.