Step 1: Insert New Object (Video) , you can name it as "Video" itself.
Step 2: Copy and paste the object in the desired layouts and resize it as you prefer.
Step 3: Under "Files" section, right-click and add a subfolder called "myVideo".
Step 4: Right-click on the subfolder "myVideo" and import files and then select the video from your PC. (for ex, testVideo.mp4)
Step 5: On the corresponding eventSheet of the layout containing the object "Video", add an event "On Start Of Layout".
Step 6: Add Action -> Video -> Set Source -> H.264 source = "testVideo.mp4" -> Done
Step 7: Add Action -> Video -> Play -> Done
That's it! Enjoy!!