Ken Burns effect

[Initiostar]

I used the WOW slider with some CCS additions to allow text over the slider > https://initiostar.co.uk/demo/wow-animation/. Full Width with Scale-to-fit-Width.

[Acorn]

I used the WOW slider with some CCS additions to allow text over the slider > https://initiostar.co.uk/demo/wow-animation/. Full Width with Scale-to-fit-Width.

Gary, I'm not sure if WOW Slider is free or not. This did look promising: https://wowslider.com/jquery-slider-...mo.html?tw=wd8, but is heavily reliant on jQuery.

I found your

Footnote: the most processing efficient way to achieve the Ken Burns effect is to record a video of it and replace the WOW slider with the video; sourced direct from a serve.

Using CSS has next to no overhead and I would avoid a video as a substitute.
anime.js is extremely powerful for complex animation effects and I might play with that sometime.

Acorn