A question!

I shoot at long ranges and try to record it too.
I've seen Matt Dubber and Ted shooting at long ranges (100yards+)
The slow motion.usually lets you see the pellet too.I've seen in my videos that the pellet moves from upper mildots and then reaches the bottom holdover mildot.
A guy on youtube (he's very famous)
Uploads slow motion long range hunting videos I've seen his videos on my android tv.He's also shooting around 100yards or so.I've seen that the pellet doesn't come from upper mildots and is directed like it goes straight.Is that possible?
 
External ballistics of projectiles is a very complex science, as is internal ballistics. Read that as; knowledge of Calculus required!

Basically, the projectile follows a parabolic curve. It travels higher than the target center over the distance it travels, then back down again. So if you're watching from behind, the phenomena you describe is correct. 
 
Is it also true, The faster the pellet the less arch it will have, (Not above the sound barrier
800 FPS 18gr pellet will have more of a arch Than a 960 FPS 18 gr Pellet?
A guy shooting a 960 fps gun at 100 yards and some one shooting a 800 fps gun the pellet would look different to the shooter if he could see it,
I got a lot of that on the Marauder site when I stepped out of the 177 cal dark closet and seen the light with a 25 cal PCP,
Mike

 
One thing you could do, is download Chairgun. This free application will allow you to plug in some weights and velocities, and see the actual curve in graphic form.

As for drop... I have my .25 caliber Marauder set up at 884 fps, using a 25.4 grain pellet. Targeted at 50 yards, the pellet is within 1/2 inch of he POA from 17 yards out to 55 yards. At 70 yards, the drop is nearly 3 inches. At 100 yards, it is 12+ inches low. And, you can print out a range card from Chairgun to refer to when the distance to target is more than your sight in range. So of handy to have.