The short answer is yes - but there are a few nuances to consider.
If you use Wochit with your own content you can use the produced video everywhere and anywhere as long as your content is licensed for that - including for ads.
If you want to use Wochit content in yoiur video ad - you need to use the "Creative Library" - which you will find under the creative tab when you search for content.
All of the content Wochit gives you access to in the creative library is OK to use commercially, as ads - with one caveat: digital use only, no broadcast. As with all other usage rights, you can only use the video you produce. You can not re edit some or all assets from the video in a different platform or software.