That's a big file indeed. Why did you make it? Photo's and video's already are compressed, so there's hardly anything (or better said: nothing) to win by trying to compress it again. While - as you notice - there is a much bigger chance of losing something (or: all). And password protected, moreover. That only makes sense if that pictures and videos are such that you would want nobody to see them, such as child porn or preparing a terrorist attack.
All you can do yourself: try different recovery programs and be patient. For each recovery program you try, make a fresh copy of the original, so that the things the first one did don't influence the second one.
I am using a trial version of Winzip and am not able to extract one of my zip files with a huge size 47.5 GB, password protected which contains mainly my photos and videos. The error message is "Unable to find the local header for (file name)". I am trying to use "Recovery toolbox for zip" to repair and extract the file, but the program keeps running for hours and I don't know how long it is going to take (hours, days, weeks???) Please advise.