First off, I'm a novice to node compositing, so I might not understand some jargons.

Below is the original video. enter image description here

Next photo: the white background is removed (my first time with invert node). The background is turned transparent. Now how do I lay this overlay upon another video or image with any different colour? I'd like to try medium brown ground or yellow for the lower ground.
enter image description here

The next day... I have tried Alpha Over as was suggested. Initially, it was tricky and difficult to work with nodes, while making mistakes. Now, I have finally achieved the desired result and here I enclose the screenshot. enter image description here

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