If I'm ever trying to string together a presentation of some sort, I tend to note down the key points in a bullet point style format. Then work them into a paragraph or so each, edit said individual paragraphs until they're how I want them, then try and link them together so it flows better.
I realize you may not do things this way, but maybe it's worth a shot if you've not tried it yet?
If you've having trouble with the speaking part you could try overlaying key points of text onto the video?
hey AF17 here thanks to those hacker bastards we the dedicated anime fans have lost alll our data but this is a time to start a new and continue our forums lets show those hacker bastards we arent going to abid to there hatred