I look at these processes all the time, there's a forum called goldrefiningforum, there you will see all people who are into refining precious metals, gold and silver, the only problem is to get your hands on the chemicals involved such as Nitric Acid, sulfuric acid, in the UK it's crime to carry Nitric Acid for example, and you if you want it, you will need to submit a form to Home Office with lots of information, including your GP mentioning that you are not mad. Understand the processes involved to refine gold and silver, and the most important, the safety of dealing with deadly fumes, when mixing boiling acids with metals, it can kill you, your family and animals. You will need a fume hood to operate it and not to mention how to deal with the waste materials, you can't just dump these things in the drain. Also, the acid fumes are very corrosive. I see many crazy people on Youtube doing it at home, which can be very deadly. I wish one day I can have my space with all the safety gears to refine my own Gold and Silver but, please, don't try it at home by yourself. I know it seems tempting, I confess I would like to try, but do your research first, also, this can't be done in a residential area.
On the video he is mixing hydrochloric acid with bleach which forms chlorine gas, you don't want to breathe it, this gas was used on WW1 to kill people.