Did Alex Mason kill JFK?

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Is it implied that Alex Mason did kill JFK after the events of Black Ops 1? Canonically, since Black Ops 2 follows Black Ops 1, I find it weird is nothing is mentioned about JFK in Black Ops 2.
In the final mission Mason confronts Dragovich, saying that the brainwashing Dragovich had attempted to do had failed, but Dragovich seems to remark otherwise "Oh?" & "Tried?". The final shot of the game, showing a film reel showing the president moving through a crowd with Mason as the final clip implies he was assassinated? Or not?
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