[Ismet Arnautalic]"Is it possible to convert SD video from 4:3 to SD 16:9 without squeezing pictures? (loosing part of pictures on top and bottom)"
Not really. How can you take the 4:3 space...and make it 16:9 without stretching it...or cutting off the top and the bottom? How can you do that? Make a square into a rectangle without changing it's shape?
[Ismet Arnautalic]"If it is not possible:
Can I decide which part of picture I must loose. I prefer bottom part."
You'd have to capture as Pillarbox, and then manually blow up the picture the last 33%, and pan and scan it.