There are free ones for almost every platform.
Which operating system are you using? For Windows and OSX (Mac) there are tons of options, for example https://hitfilm.com/express : it supports animated masking (so you can censor parts instead of cropping the whole image), but of course also the standard stuff (cropping, zooming) and tons of things you won't need for now.
For simple cropping and zooming there is software with "simpler" user interfaces (but I personally have difficulties working with them), for example Windows Movie Maker or iMovie. Haven't used them in a while, though.
For Linux, things are harder. Maybe http://cinelerra.org is worth a try, although their workflow is not that great compared with HitFilm or expensive stuff. At least it was the last time I checked.
Sadly, censoring means that I can't just do it for you (as you need to trust the person doing that with the unedited files), so I hope that at least helped a tiny bit - feel free to ask if you need something else.