This is all very strange...But I do not think the OP is trying to fool anyone by sending malicious files. He could put the file directly for download if that was the case. Or he could send it to anyone who asked. However, he asks for evidence that anyone offering to help demonstrate on video how he will recover. But, it may be that the OP is trying to trick somebody or do some kind of crime with that request for help.

To offer 100BTC, which today is worth almost half a million dollars, I believe it has something like 5000BTC in this wallet. I have tried to find some wallet that had been opened for the last time in 2016, but I did not find it, maybe someone can do it. The video was posted by a personal profile. In a few minutes, it is possible to discover the profile on facebook and some other social media. In addition to some news related to MLM scam, That may be about the same person or just a coincidence about the same name.

But there is a high possibility that this can be an elaborate attempt of a scam or is an attempting to recover the funds that were obtained with a MLM/scam. So anyway, since the OP does not want to write in a clearer way telling what actually happened, and did not try to use the help offered by gmaxwell, I could only thank him for making Bitcoin more rare and valuable.