Update Video element design

Description: **VALUE STATEMENT:**
As a user, I can see updated video element designs.

**ACCEPTANCE CRITERIA:**
– Custom playhead
– Skrim over thumbnail (semitransparent layer)
– Video Title in bottom left corner (optional)
– Duration in bottom right corner

**DESIGN NOTES**
– **[Zeplin Design](https://zpl.io/bozPrGa)**
Owner: