Von Miller Scrambles to Block Cancun Sex Tape ... I'm Being Extorted for Millions

Von Miller is going on the offensive -- trying to block a woman from releasing a sex tape shot in Cancun ... and claiming she's demanding $2.5 MILLION or else. 
The Denver Broncos superstar filed legal docs in L.A. County Superior Court under the pseudonym "Doe" --  but multiple sources confirm "Doe" is Miller.
In fact, he's described in the legal docs as "one of the most talented people at his craft in the U.S. and the world."
In the docs, Miller says he met a woman named Elizabeth Ruiz during a trip to Mexico in June 2016 -- and the two had sex while they were alone indoors.
Miller says the woman recorded the sex on her cell phone -- but he insisted at all times she keep it private. He claims he reached out to her after the trip and asked her to destroy the recording to which she replied, "Gotcha."
Miller claims the woman tried to sell the video to TMZ -- but TMZ shot her down.
That's when the woman gathered a team and tried to sell the video back to Von for $2.5 mil ... Miller claims in the docs. Miller's people also shot down the request and claimed the woman was trying to extort him.
Miller is now asking a judge to block the woman -- who lives in L.A. -- from going public with the tape.
We reached out to Miller's rep multiple times. So far, no word back.