Whatever you do, do not use any resources on the web site calling itself International Women's Day. This is a corporate company that has appropriated IWD as a money making venture.
And it is a great shame that so many women are so easily taken in and just follow it with engaging their brains.
IWD has a very varied history, for instance in communist Russia it was common to give women flowers as though doing this would offset the fact that many of them were doing long days paid work, and then going home to do domestice work.
But was associated in western countries with women demanding better workding conditions.
In 1970s IWD influenced by the WLM became more radical, and was usually the occasion for marches or local get togethers to celebrate what women had achieved and what they wanted to.
This is the UN's history of IWD www.un.org/womenwatch/daw/news/womday97.htm
Maybe as the video is for your work, you could look at it from the perspective of that work and women's role in it.
Or just stick to the basics ie around the world women are discriminated in terms of being the ones who give birth, unequal pay, violence, sexism. You could easily get stats on that.
ie IWD is a reminder that sexism is alive and thriving and that women have the right to equally participate in society.