There are at least stills from Apollo 8:
In this historic photo from the U.S. space agency, a reentry photograph of Apollo 8 which was taken by a U.S. Air Force ALOTS (Airborne Lightweight Optical Tracking System) camera mounted on a KC-135A aircraft flown at 40,000 ft altitude. Apollo 8 splashed down at 10:15 a.m., Dec. 27, 1968, in the central Pacific approximately 1,000 miles South-Southwest of Hawaii.
The reentry phase was nicely visible, but a long way away from the splashdown point.
Assuming the end of blackout is also the point where the capsule no longer leaves a bright trail, that's 400 miles out from the splashdown point (where most of the cameras would be).
So they used long-range land-based aircraft to observe this (KC-135 is more or less a Boeing 707).
ALOTS is a high-speed film camera capable of 10-80 frames/s. This source calls ALOTS a 'still film' camera though. And the way this is worded, I don't think there was an attempt to capture the reentry in motion picture (for Apollo 11).
ALOTS was part of the Apollo Range Instrumented Aircraft (ARIA) program.
For Apollo 8 they captured 4 images:
the brightest streak at the top is probably the SM breaking up:
That site lists some other ARIA missions in support of Apollo returns, but those seem to have been radio relay missions only.
Several Apollo reentries were seen by crew and passengers on airliners, and photos were taken. This is one of Apollo 13: