Movie or television subtitles are fine. It preserves the voice of the speaker while allowing me to understand the content. However, how do people read white text on a yellow background? In this case, white text on a yellow shirt. Contrast is important for readability.

Or white on light blue.

Or white on white.

I would really like to understand the information your speakers wish to convey. If it were a drama where I could tell from tone and body language, then it would not be so annoying. This is a documentary so everyone has that explanatory tone.