I did this for my new character i didi the motion capture with the i phone x and facecap app from the appstore still wip also i managed to get the effect of her face changing using anim curve controled buy certain blendshape. special thanks to texturing xyz for those multichannel maps.
Here you can check the article i did about how i made this.
https://texturing.xyz/blogs/all/safwen-laabidi-creating-a-realtime-character-for-facial-animation
Unreal Engine 4 - elf animation using facial capture