Feature Request: Adding padding on all sides of video with a background image

[ranwer-dev]

When we record a window, it will look better if we can add padding on all sides and use a background image for that area. Like Without Padding

https://github.com/sskodje/ScreenRecorderLib/assets/92986100/5923a392-627e-45f3-8dee-97a7ac249613

With Padding

https://github.com/sskodje/ScreenRecorderLib/assets/92986100/b88e3e4d-dbf8-48a1-99a9-a63d378c4063