I cba watching that video, but it a subject I know a bit about. Depends what country you're interested in, but, thinking of a few of them:
Japan: Ill Will just recently published this on Japan's long '68, the article wasn't the easiest to read but definitely informative about a bit of history I didn't know that much about before:
Life of Militancy: Japan’s Long ’68 • Ill Will
Italy: the Angry Workers publish a fair bit of stuff about 1970s Italy, most of it isn't about the armed groups because that's not the most interesting bit of the situation, but they did this on Senza Tregua (No Ceasefire/Respite, which is confusingly also the name that the Bruce Willis film Hard Target was released under in Italy, I don't think Bruce Willis has any other connection to armed Italian Marxism though) which is pretty interesting:
Senza Tregua – Working class political committees and violence in Italy 1973 to 1976 – Lessons for today - Angry Workers
Then there's your general texts on 70s Italy like Living With an Earthquake, States of Emergency etc:
Italy 1977-8: Living with an earthquake - Red Notes States of emergency: cultures of revolt in Italy from 1968 to 1978 - Robert Lumley
libcom.org
West Germany: I remember Lost Honour of Katharina Blum as being a decent novel, and Deutschland im Herbst is worth a watch if you fancy a long film about it? I remember How It All Began by Bommi Baumann as being an interesting read for a first-hand account, although iirc he was like weirdly neutral about
the Tupamaros West Berlin's attempt to bomb a Jewish community centre on the anniversary of Kristallnacht, which has to be right up there as one of the very worst ideas that anyone on "the left" has ever had.
USA: Recently read the book
Rattling the Cages, which as a book about people who've served time in relation to political activity has a fair bit of relevance to this subject, it's not often you get to hear directly from people who'd been involved in the SLA for instance. Also, I think the history of 70s political violence in the US tends to get remembered as being mostly about the Weather Underground, and by extension as being about relatively rich white student kids, is worth mentioning that there was also the tendency within the Panthers that went underground and eventually became the BLA - plenty of sources if you fancy reading more about them, for instance
A Soldier's Story by Kuwasi Balagoon - and then groups like the
George Jackson Brigade and United Freedom Front, which were more made up of white working-class Vietnam veterans and the like. And to be clear, I don't think the choice to pick up the gun was a good one in any of those cases, but from a historical perspective, it seems a lot more explicable if you look at it from the perspective of Vietnam veterans who'd already been trained to fight.
And then there's Northern Ireland, which is a whole different story again. Not read
the new book on the FAU, but that sounds interesting if you wanna learn more about armed struggle in Uruguay?