Outline glow video that changes while the video plays

Hi!

I'm editing a video of an exhibition view of a video installation. The video consists out of a still image of the exhibition space on top of which I have placed the two original video's, that are playing. I want to make it look more realistic by adding depth to the clip but also an outer glow that reflects into the space. The glow has to change and reflect the light/darkness and colours of what is showing in the video to the outline around the videoframe. For example, in one frame of the video, the image is red and in the next it's white and in another there is not a lot of light coming from the image. I'll add some screenshots to give an idea. (I hope my explanation is clear.)

How can I imitate this effect?

I've only found instructions for an outline effect that stays the same colour all the way through the video. But not how the outline glow effect reflects what is happening in the video itself.

ps. the white glow coming from behind the two video's is from the background image (installation view).

Best,

Anthe