I am really new using processing or any programming languages but i have been playing for fews days with processing and i really like it and i saw what can be done so i will give it a try. So the first step was to get a book so i got Getting Started with Processing. Its very good for real beginners. 

My Question is how can i insert live feed from a webcam into the 500 rectangles that is reacting with the music?

It works with images and also i got the live feed but it blink a lot so i couldnt really see what was going on.

2. 
   
3. 
   
4. import processing.opengl.*;
5. import codeanticode.gsvideo.*;
6. 
   
7. 
   
8. import ddf.minim.*;
9. import ddf.minim.signals.*;
10. import ddf.minim.analysis.*;
11. import ddf.minim.effects.*;
12. 
    
13. 
    
14. 
    
15. Minim minim;
16. 
    
17. AudioPlayer music;
18. 
    
19. GSCapture cam;
20. FFT fft;
21. 
    
22. 
    
23. Square[] square;
24. PImage a;
25. 
    
26. int numItems = 700;
27. 
    
28. 
    
29. void setup(){
30. 
    
31.   size(800, 600, OPENGL); 
32.    a = loadImage("jelly.jpg");
33.  
34. 
    
35.   minim = new Minim(this);
36.   
37.   music = minim.loadFile("Sound.mp3");
38.   
39.   music.play();
40. 
    
41.   fft = new FFT(music.bufferSize(), music.sampleRate());
42.   
43.  
44.   square = new Square[numItems];
45.   for(int i=0; i<numItems; i++){
46.    
47.     square[i] = new Square(); 
48.   }
49.   
50.  
51.   smooth();
52.  
53.   hint(DISABLE_DEPTH_TEST);
54. }
55. 
    
56. void draw(){
57.   background(0);
58.   
59.   
60.   fft.forward(music.mix);
61.   
62.   
63.  
64.   
65.  
66.  
67.   
68.  
69.   
70.   
71.         pushMatrix();
72.         translate(width/2, height/2, 0);
73.     for(int i=0; i<square.length; i++){
74.    square[i].update();
75.    square[i].display();
76.   
77.   }
78.    popMatrix();
79.   println(frameRate);
80. }
81. 
    
82. void stop(){
83.   music.close();
84.   minim.stop();
85.   super.stop();
86. }
87. class Square{
88. 
    
89.   int band;
90.   float radio;
91.   float sizes;
92.   float rotationX, rotationY;
93. 
    
94. 
    
95.   Square(){
96.     band = (int)random(0, 256);
97.    rotationX = random(0, 360);
98.     rotationY = random(0, 360);
99.     radio = 100;
100.     sizes = 10;
101.   }
102. 
     
103.   void update(){
104.  
105.     float fftVal = fft.getBand(band);
106. 
     
107.   
108.     float radioMim = 20;
109. 
     
110.     float radioTarget = fftVal * 2;
111. 
     
112.  
113.    
114.     radio += radioMim+ (radioTarget - radio) / 10;
115.   
116.     
117.     float sizeTarget = fftVal / 2;
118.   
119.     if(sizes < sizeTarget){
120.       sizes = sizeTarget; 
121.     } 
122.    
123.     else {
124.       sizes *= 0.95; 
125.     }
126. 
     
127. 
     
128.   
129.     rotationY += 0.01;
130.   }
131. 
     
132.   void display(){
133.     
134.    
135.     pushMatrix();
136.     
137.     rotateX(rotationX);
138.     
139.     rotateY(rotationY);
140.     
141.   
142.     stroke(255, 0, 0, 20);
143. 
     
144.     
145.     
146.    
147.     translate(0, 0, radio);
148.     
149.     
150.     stroke(255);
151.     fill(100,0,0);
152.     
153.     rect(-sizes/2, -sizes/2, sizes, sizes);
154.     
155.    
156. 
     
157.    
158.     
159.     
160.    
161.     
162. 
     
163.     popMatrix();
164.   }
165. }
166. 
     

If somebody can help please let me know.

Thanks and sorry for my English.