How to Place a transparent control on Videoscreen when mouse

Just select the control and set the alpha color of the background to 50% or any.. can make your control transparent.

I need a transparent control on what i have posted please help me out this

First of all, there is a mediaplayer control available in wpf, so there is no need yo use 3rd party control in WindowsHostControl. 2. You can set the alpha color of the control to make control transparent