No, a plea bargain is a forced confession under the duress of being threatened with being tried for extra charges that the prosecutor does not believe you can legitimately be convicted of.
Yes, a plea bargain is basically:
"you might get 5 years for this and 20 years for this and we'll try to pin these other 3 random things on you too so why
don't you just accept 3 years and save us both alot of time and money"
but it still comes down to either what the police think they can pin on or what they can make you believe that they can pin on you in a trial.
At the end of the day it's still both sides evaluating "what are my odds of winning and what do I get" vs "what are my odds of losing and what do I lose".
If there is a video tape (or a missing video tape that should be there) then you have alot more negotiation power even in the pretrial
and there's a good chance that if the video tape is missing or doesn't make the cop look good that they are going to quickly try to
drop the charges or settle out of court.