Check out example codes for "how to play video in ui unity". It will help you in understanding the concepts better.

Code Example 1

//Step 1: Add Video Clip to assets
//Step 2: Create "Render Texture" in assets (Create-Render Texture)
//Step 3: create "Video Player" in hierarchy (Video-Video Player)
//Step 4: Create "Raw Image" as a child to your canvas (UI - Raw Image)
//Step 5: Drag your Render Texture to the "texture" of your Raw Image
//Step 6: Drag your Video Clip to the "video clip" of the video player
//Step 7: Drag your Render Texture to the "target texture" of the Video Player
//This should work. If this doesn't work check the video in the source.

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