I don't care what's on your video - Frank Marshall Davis was not Barack Obama's father. Obama doesn't resemble FMD any more than he does BHO Sr.
I come from mixed negroid/caucasoid ancestry myself, and I can tell you with utmost certainty, that Obama would look a lot more negroid if either one of those men were his father.
There are photos online of FMD's son and his father. Look at all three of those men together, and see if Obama looks in any way related to them. He doesn't. Not even close.
If one wants to go purely by facial, cranial, and build similarities, Malcolm X is about as close a match as you'll find to Barack Obama (not that I'm trying to make the case for MX being his father).