This guide shows the process I did to put my custom video as the OP. (sorry in advance if the guide is sloppy, it's my first one)

Don't want to convert or make a video yourself. That's fine. Just use mine and skip all the steps except for the 'ToZ Tweak Tool' step.

Download
https://drive.google.com/file/d/0B_4kfMMRNKVyZl9wSDlYUDVzOWs/view?usp=sharing

• First, Select or make your own video using whatever video editing software you choose.
♦ MAKE SURE you render the video at 720p at 24FPS using the (.wmv) format. It seemed to work the best for me, had problems with (.avi)




♦ TIP* make sure the quality is all the way up on the encoder option for a better quality final product

♦ DOWNLOAD* http://www.radgametools.com/bnkdown.htm

• Using 'Rad Video Tools' select the video you render at 720p 24FPS and selct 'Bink it'


• IMPORTANT! Make sure you change (.bik) to (.BK2) or else it won't work


• Just click on 'Bink' and let it do its thing

Just head on over and get the necessary files to do the rest. Plus it does A LOT more then switching videos over, I strongly suggest you actually check out what else it can do.
♦ http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=542500356

• So after you have everything ready with 'ToZ Tweak Tool'. Open it up and click on the 'Graphics' tab.



•Chose 'Change Intro Video' and select the video you just converted using 'Rad Video Tools'


•MAKE SURE TO CLICK 'SAVE'

AND BOOM you're done. Yay for you. How do you feel? Alrighty then. Hope I was helpful to you.