The video was kept secret until word of its existence was given to an Israeli lawyer who broke the news. The video ended up in an Israeli TV expose.
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Here's what I found on this incident...
Ketziot is the largest security prison in Israel, with some 2,200 prisoners. The Prisons Service took over responsibility for it in 2006.
According to the operation’s orders, which Haaretz has obtained, and a Prisons Service investigation into the events, the operation had four goals. One, the surprise search, with the assistance of the Masada unit, was to “impart the element of deterrance.” The second was to “increase morale and motivation” among prison guards. The third was to raise the level of the guards’ skill, and the fourth was to uncover contraband that could be used to compromise security in the prison.
In his pre-operation briefing to the participants, Cohen said: “I am glad this operation fell to me in Ketziot.” Citing the morale-boosting element, Cohen also said: “If we manage to surprise the prisoners, all the better. If it is uncovered [beforehand], there will be shouting.” Cohen also told participants “the population is expected to respond in any case.”
The operation began as planned at 2 A.M. But four minutes later riots broke out that gradually spread from section 12b to the whole compound. Prisoners became violent, set the section on fire and threw objects.
According to the Prisons Service investigation, at 2:12 A.M., Cohen ordered the Masada unit team into the section, where the prisoners live in tents. The team commander said he encountered “a large number of prisoners” who threw objects at him. In describing Ashkar’s death, the Prisons Service investigation states: “The team commander opened fire according to the rules of engagement, toward the legs. A prisoner who entered the line of fire was shot in the head.”