To be honest I don't think it's fair of that youtube video to include the Iran-Iraq war or Operation Desert Storm (I'll explain about the events of 1991 later on in another post)
The Iraqis actually performed rather well in the Iran-Iraq war given the circumstances. Whilst Historians like to claim that Iraq had some sort of massive advantage they actually did not. At least not in 1980 anyway.
Iraq launched a surprise attack against Iran in what was essentially a peer to peer conflict. The only advantage the Iraqis had in the beginning was really the factor of surprise and the fact that the Iranians were disorganised after the 1979 revolution. Iran had a better Air Force at the time - F-14, F-5 and F-4 Phantom. The Tomcat at the time was state of the art and the Iranians had enough spare parts in storage to operate these jets for at least 3-4 years. Also numerous state of the art AH-1 attack helicopters were used by the Iranians. Hardly an easy foe.
Also Iraqis invaded mainly using T-55s and T-62s whilst the Iranians had Chieftains and M60s - arguably better tanks.
One of the largest tank battles in the War in 1981 resulted in a massive win for the Iraqis:
en.wikipedia.org
The Iranians had the advantage of man power - thanks to Revolutionary guards and various militias (the overwhelming numbers from human waves providing a nightmare for static positions such as mortars, artillery, heavy machine guns etc.. Iran also had state of the art weapons such as AGM-65 maverick at the time and armed their F-4 Phantoms and AH-1 attack helicopters with it. The Iraqis had nothing like that in the irArsenal.
in 1980 Iraqi Air Defences where still in a rather "primitive" state so the Iranians already had a massive air advantage from day 1. I believe the Iranians even secretly coordinated air raids with both Israel and Syria into Iraqi territory. Despite that the Iraqis still managed to capture large swathes of Iranian territory in the ground war from 1980-82
The Iranians were covertly supported and re-supplied by United States, Israel & France and had direct support from Syria, Libya and China.
It was only in the later stages of the war. Specifically 1985-1988 when the Iraqis gained the technological advantage in Artillery, Air Power and tanks (thanks to the T-72). However the Iraqis were severely crippled from within due to facing a Kurdish Insurgency in the North and various Shia uprisings throughout Iraq and sabotage by Shia within the actual Iraqi Army itself.
Despite facing all these difficulties - covert and direct support to Iran from various 1st world and Arab countries, deficiency of air power compared to Iran in early stages of the war and slightly less parity in terms of state of battle tanks at their disposal - the Iraqis still managed to capture more Iranian territory throughout the war than the Mullahs did to Iraq.
In fact it's a statement to Iraqi Armed forces in the 1980s that they did not lose any cities like Basrah or Amarah to the Iranians given what they were up against.