I have around 5 weeks to lose some weight. I'm going to be acting in a music video half naked and I would like to get my weight few kg's down

I'm now 79kg/180cm so I'm not fat, but I have developed a little extra fat on my belly area.
What would be the best way to get my weight down with "home training" and lose the belly? I can traing daily, that's no problem. When I trained few months ago for few weeks, I used exercise bike 1 hour every day, did some push ups and sit ups. Wasn't that hard training, but didn't really see any changes in that small period of time.
any tips are welcome. I know that I have to think what I eat too :p
I have exercise bike and small 15gk dumbbells in my home that I can use.