Captioning seems like a great place to start. You can try some beginner friendly sites like transcribeme.com captionpro.us 3playmedia.com. Source: about 2 years ago

There are services such as 3playmedia.com that can transcribe within 2 hours of upload and deliver a .VTT or other subtitle/caption file (whatever is required for captions in your editing software). Our company has a monthly contract with them. They do a good job. There's an option to edit the text in their word editor if needed after they have transcribed. Good luck. Source: over 3 years ago

If they're all Apollo mission images like the one above, those have all been scanned from the original flight film (mostly by me) and archived. We have digitally archived ALL of the manned mission flight film. We're currently working on digitizing what we call "institutional" imagery, images shot by Earth bound NASA photographers. We're only up to 1968 so far so we have a long ways to go, but we'll scan them all... Source: about 1 year ago

You might also want to take a look through https://images.nasa.gov/. Source: about 1 year ago

Note: We pull these from https://images.nasa.gov, and are not endorsed by NASA in any way. We simply like space pics. Source: about 1 year ago

I think you'll be able to find some other footage on the NASA media library. Outside of that, you'll have to FOIA. Source: over 1 year ago

I meant NASA images from this site: https://images.nasa.gov/ not the NASA logo. Source: about 1 year ago