Create Light Wrap

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https://www.youtube.com/watch?v=U8Mvxl89R5g⁠

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Apply a 3d object and a Background video footage respectively

Apply Set Channels on 3d object layer (in Effect → Channel)

Set Red, Green and Blue to the BG video (here is the beach BG)

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Apply Gaussian Blur, amount to 50

Apply Invert, Channel set to Alpha

Apply CC Composite, set Composite Original to Stencil Alpha

Duplicate CC Composite, this time set to Screen/Multipy/Lighten(more subtle effect), untick RGB only

Fine tune the GAussian amount to change the softness of the light wrap result

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