Dinamic OSD with max7456?

hello everyone,

i am a little bit newbe at atmel and i can put some char on osd with max7456, and i can re-organize 256char table with custom char but!! i have question about this IC, i wanted to put just one pixel white dot in every pixel on pal video. i wanted to draw dynamic shapes (live artificial horizon with accelerometer) on screen is it possible, or just 256char table only i have?

thanks