How do I erase a specific Porn video from my brain?

Time, man. Time. You are going to have that video come up how ever often it needs to. That and other pictures and videos, and fantasies, and urges to go dive back in, or sudden impulses to oggle women in ways you may have never before. To all of these things, the only remedy is to reorganize your life so that you A) aren't using anymore, and B) are limiting any and all triggering media and situations to as little as humanly possible. If you can do that, it's all just a matter of working through all of moments that your mind's gears start spinning over porn, staying on the path, and letting your mind slowly let go of that dopamine blast that it used to get. It takes time, but it will always happen eventually.

 

EXACTLY!! Time will heal it, but you clearly have to stay away from it. Avoid that stuff ant it will fade over time.

 

As soon as it comes into your mind, you have 5 seconds to pivot to something else.
It is your mind trying to trick you into giving it a dopamine flood.
As soon as it triggers you, get up, move to a different place, do something completely different to what you were doing when the thought came into your head.
Again, IMMEDIATELY change what you were doing.
Get a cup of coffee, go for a walk, play with the dog, chase a cat, just do something completely different.
Eventually, your brain will accept this is not going to give it what it wants and will forget it.

Cheers for now.

 

Meditate, go on a walk, do some breathing techniques, socialize, read a book

 

Agreed with other posters. It's just a matter of time. You'll forget it without even realizing it. Then one day randomly something will remind you of this thing you used to know, and you'll realize you've forgotten and even *trying* to remember doesn't work.