I am interested in this final match videos to further examine what happened on that competition field. If you were me, where and how would you search? Any ideas and suggestions? Thank you very much!
Is it not on TBA? (https://www.thebluealliance.com/) If you know a team that was in that match, search for that team, go back to 2016 and if you look through their matches, you’ll find it there. TBA gives you a rundown of the match, Even if there is no video. Hope this helps! 
It appears you might be out of luck for both matches, but the second finals match is available.