As you know, if you have VSL enabled it takes the place of the DJ FX in group 5.
You can then remap the DJ FX to another group.
Check page 38 of the manual here -->
serato.com if your not familiar with remapping the buttons/knobs on the 57.
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Also, are there any videos for controlling video-sl through the 57?
There is no video that I'm aware of but you can download the pdf of the overlay, cut it out, and put it on your mixer to have a guide of what everything does.
The overlay can be found here -->
serato.com