This can be done safely and effectively provided, of course, that the
jump operations and glider pilots in the area are on the same frequency
and communicate diligently.

A jump operation coexisted with Estrella for some time but that was
long before I gave up skydiving and took my first gliding lesson there.
I never heard of any associated problems.

There is at least one airport in southern France that hosts (or did
host) major skydiving and soaring operations. There was a fatal
incident some time ago when a skydiver in freefall hit a glider,
directly over the airport.

~ted/2NO