100 years isn't so long. They people who open the container will almost certainly be able to read instructions - and probably have reasonable technology to access the contents. But maybe they don't care enough to go to a lot of trouble to do it? It's very likely that the images you store will still be easily accessible in the future.
If you don't think they'll go to very much trouble - then you should provide them with the means to replay the data as well as the data itself. There are plenty of small video players (like a cheap digital camera or an MP3 player with video capability) - so long as you pack them appropriately and protect them from crazy temperature variations, they should last a long time in storage and still work at the end. Provide written instructions on what power requirements the machine has - and what buttons to push to access the content.
But quite honestly - there is unlikely to be anything in the data you provide that won't be accessible by then.
I would stick with physical objects that would be of historical interest, personal items - a snapshot of the times when the capsule was buried.
Maybe it would be worth trying to find people who've opened capsules like this - and ask them what was found to be most valuable from the contents?