HOW to convert serial RGB to parallel .i am using the ip\LCD_Panel_TPO_TD043MTEA1

you can write an external module to do this.

But I recommend you replacing the video_sync_generator with the clocked_video_output component whose data out can be configured as parallel.

clocked_video_output use a conduit end port for Video clock input, in sopc builder it's clock can be the same as sgdma, and it has a data fifo within it, so you don't need a dual clock fifo on the streaming line.