The video is total Neo-Nazi, Holocaust denial propaganda, which is made quite plain by the description of the video. The existence and use of gas chambers at Auschwitz to murder ~1 million people is an incredibly well documented fact. There are a number of fantastic debunkings of these denialist talking points out there which I can point you to for an expansion on this, but I'm rather a fan of this one by /u/elos_. Also, we don't like hosting such disgusting filth on AskHistorians and providing view counts to that video, so I have removed this submission. If you would like to have expansion on this topic though, feel free to ask something along the lines of "How were executions of prisoners carried out at Auschwitz during the Holocaust?" or something along those lines.