There are a number of movies out there but some are not directly about the assassination mechanics themselves."Fatal Deception: Mrs. Lee Harvey Oswald" with Frank Whaley, he's in JFK as well as one of the LHO doubles in the conspiracy theories. I might have seen it, there is also I believe it is called "Love Field" about the couple that travels to DC...but it is only about the way life was in America that day.
No "Executive Action", I have seen it. I don't know if it is at youtube. It's been awhile, I did not absorb it well at the time.
It's a pity Marr's 'Crossfire' wasn't an option. That is the biggest lie surrounding the case. Not just a lie though; it was imo an intentional series of lies which makes it a shameful disgrace.
Crossfirehttp://mcadams.posc.mu.edu/books.htm 'The virtue of this volume is its comprehensiveness. Marrs seems never to have met a crackpot witness he didn't believe nor run across a conspiracy factoid he didn't accept. You'll get the full case for "conspiracy" here, the good, the bad, and the downright wacky.'-John McAdams