I believe that the Orville Nix film contains a view of at least one of the assassins of John Kennedy. Take a look at the activity in the Pergola. The stabilization and enhancement of this film has yielded dividends.
Click on the x on the movie above to enlarge.
Take a look at the upper right in the circled area and you can see that the activity is following the Limousine’s progress from behind the Pergola.
Here is is even more cropped and enlarged