Bird Box, starring Sandra Bullocks, is about blindfolds.
I have not seen the full movie but parents should decide if children should watch it. As far as I can tell, no one is bound and gagged so it might be safe to see from that angle. It is important not to try to do the Bird Box challenge without people watching to prevent injury. Here are two good examples:
You can tell that this lady blindfolded them so they could not see anything.
In this next video, a mother blindfolds her kids at a toy store: https://www.youtube.com/watch?v=kvraZ9hAksY&t=227s